Not necessary for you or for everyone? It's nice to have the choice for those who need it. Just as portable versions are ;)
i don't care about me, i care about useless bandwidth usage, and useless disk operations
don't ship with waste, it's never a good idea, and gives bad impression about the software, when it's too big, it is a sign of incompetence or unnecessary bloat
there are the people who care:
https://rxi.itch.io/tilekit (250kb)
and the people who don't care:
ldtk: 100mb 7z (184mb for x64 unzipped)
So you would like to see 32bit and 64bit separated? Because as I said: someone might want to have 32bit version.
About the size: I'm with you, a lot of applications are way too big for what they do. Especially the ones that ship a whole Browser to execute themselves ...
Its a sad trend ... But in this case: one version: ~ 75mb second version: 30mb more - should be ok, if you can handle the 75mb download.