I personaly refuse not to simply add war3mapImported\ inside my texture paths which removes potentially hundreds of cumulated clicks and tipping from other people.
I just makes life easier for everyone... Including mine so I can quickly test iterations of my own models without even clicking the import button but manually pasting them into the subfolder \ _
retail _ \war3mapImported\ which the editor will be able to read instantly.
That may be not the "default" but neither would it cause much friction to people who are just used to do extra steps instead of doing the simple thing. But this will stop causing problems for people who are actually annoyed/confused by unintuitive friction like that. So no matter how you look at it, not respecting even a 200 years old convention sounds like the most logical thing to do.
This website has tons of exigeances about what creators should do, so this is very odd to have a rule that's preventing us from doing a the extremely simple task requiring a few Ctrl+V. As you said, you can just check the texture path in an editor and it's just as easy to change it to the objectively right thing. Saving the torture of hundreds of people double-clicking, aiming and deleting every files one by one.
For example I just downloaded "Stormwind Mage Tower which is made out of 21, TWENTY-ONE DIFFERENT FILES). So I am definitely opening RMS. And it's gonna be faster for me. And it'll always be faster for anyone to have, as a default standard, to first apply the model in-game like they're going to do anyway, and THEN do the war3mapImported\ deletion part... IF it seems required ! If not, it's all win.