You claim that "devices from the same generation from the same manufacturer have very similar or even totally identical configuration". I checked the first specific example you gave, the LG G2 and G2 Mini, and they're not even based on the same SoC: the Mini has a Snapdragon 400 while the full-size one has a Snapdragon 800.
The real problem with the device-...
It would be more convenient to search for answers if the tag were split... and it were always used correctly. But most of our visitors have no idea of the difference. Even the existing tag isn't always used appropriately, and I don't think introducing new, finer granularities is going to help that. For this reason, I don't believe that the split you suggest ...
No, and it should be burninated.
Questions about the Stack Exchange Android app should go on Meta Stack Exchange with the android-app tag.
Questions about the main site should come here, to Meta Android
I agree with Al on file-folders and home-screen-folders.
I also agree with not needing a separate tag for the mail folders (the email tag should be sufficient here).
Number 4 (gallery) are in practice most likely filesystem folders (except when tags would be represented as folders). I don't think this would need a separate tag.
But I'm a bit unsure where ...
I don't think we should jump the gun on the tag cleanup process.
While I can't find any examples at the moment, on multiple occasions I've run across a question where it is the only question for a tag and was able to find a minimum of two or three other questions that could be so tagged.
Sorry for short-circuiting your vote, but this seemed pretty clear-cut to me since most of the translation questions were in fact localization questions. I've merged and synonymized.
I think languages is alright to stay separate since it seems like a proper subset of localization, but I'm open to other options.
Unless there's an actual app called "RSS Reader" that will be the source of questions, this seems like a reasonable merger to me.
Although, honestly, the question counts are so low we should just edit them. If the tag resurfaces later then let's create a synonym.
I agree with GAThrawn on "solution 1": a cleanup never hurts. I'm currently not sure whether we really should remove/synonymize the tablet tag, as I pointed out in my comment on Flow's answer:
Here comes the idea to GAThrawn's "what they would be":
What about questions really specific to "dialer-less devices", e.g. including issues with apps requiring ...
Yes: Let's merge the two, as it very likely covers the same questions/topics. The "Kindle Fire" mentioned by GAThrawn would be covered by amazon-appstore already, and other markets are covered by alternative-markets.
recording should no longer be used; I've retagged the handful of questions that were using it with more specific variants to disambiguate it. It is not a synonym of anything at the moment since the more specific tags will appear in the tag autocomplete anyway.
I renamed to device-firmware to make it a little less ambiguous, but didn't do anything with the ROM/custom-rom/etc portions of it at this point. It might be worth a separate discussion of some sort, but I could feasibly see reasons why we would want these separate (e.g. "device firmware" could refer to camera firmware or something, not necessarily the phone ...
One of the timer questions was miscategorized (I retagged it) and the others seemed to fall under the clock app as you've said. Merged and synonymized!
The breakdown of the other tags looks good to me.
I did the following:
Replaced instances of scanner that were related to document scanning with a less ambiguous document-scanner tag; created a wiki for this new tag.
Removed scanner from 2, 3, and 4 that you noted. Retagged 4 with hyperlinks
Added a wiki for media-scanner to help make clear the distinction between it and document-scanner
Left scanner to ...
So most of this already happened at some point (October of last year, it looks like?):
charging is the master for both "charger" and "battery-charging"
power-management is the master for "battery-manager"
The only thing not really covered was the other power-* type tags, but there's another question specifically focusing on that anyway: Tag merge: power, ...
I say no. "Unknown sources" is (should be) about the setting. "Sideloading" is (should be) about the act of installing an app outside of the context of the Market/Play Store/etc.
They are related, sure, but I don't think they're the same.
Thinking about this again, I don't know that a merge is really necessary here. I do think that remote-ussd-attack is a little verbose, and that ussd is sufficient (and can be paired with some other tag like security if needed. At the same time, since these are such incredibly low-traffic tags, a synonym probably won't even matter.
So for now I've just done ...