I mean the gts was part of the base game from gens 4-7 which made trading for the pokemon you dont have access to much more accessible. For some strange reason they removed it from sword and shield, which is weird considering that Masuda wants the games to be more accessible to all audiences.
Now imagine if that feature is locked behind Home.
It's pokemon, we're lucky they didn't cut GTS in gen 5 to be fair.
It was already absent from Let's Go (which according to gamefreak is mainline if you didn't know already).
I'll take GTS getting cut over having to shell out for an updated version.
We missed on USUM (or USUL here) because they wanted us to pay 100bucks for the privilege of SM postgame.
I'll take the pricecut, thank you very much.
And we know we can guess at to why GTS was cut, it's not in Let's go which probably shares more of its code than with any 3DS games.
Considering that the game was rushed to the point that they had to cut the full dex and weren't even sure that they would be able to patch the mons in time for Home compat, it makes sense that they didn't have time to replicate GTS as well.
Wondertrade is in and for my money it's more fun (until it's hacked to hell and back and we start seeing wild Arceus there).
If GTS is in Home, it'll probably be for the same reason SNES/NES app is locked behind a sub : make the service more appealing.