That's a fallacy, i mean yes it is a japanese game. Japanese devs. Japanese company. But they want to make money on the western market and their shareholders are definitely not all japanese. As i said, by now the western audience is way bigger than the japanese one, which means they either have to adapt or have to bite into the lemon and burn their western market to the ground. It's a mutual relationship between consumer and provider and it has to be beneficial for both sides, if one side decides to disrespect the other too much (yes that means also cheaters cheating with plugins and all that) then the other side needs to adapt, goes both ways.
And yes there are also western players hating mods/plugins/addons and whatnot. And there are probably japanese players being alright with said tools. But you have to take into account that not all players from japanese datacenters are actually japanese but from all over asia and oceania. It is actually illegal, like 5 years jailtime illegal, to modify games/consoles in japan. I think that plays also a huge role in how the japanese playerbase sees modding in general.
Ofc addons etc. that allow players to basically cheat their way through the game should be never allowed, in my opinion. But at this point, purging every community that relies on certain addons, would damage the games image beyond repair which would cause also aftereffects for players who never touched an addon in their life. Raiders, guidemakers, roleplayers, housing maniacs and gposers are a huge gigantic influence on how the game is perceived online due to them flooding social media with basically free advertisement for the game. If SE decides to come down hard on these people i fear at the end it will hurt everyone, since we know who buys the most stuff from the cashshop, if they burn that bridge then other players will also face less content and less development and SE a huge blow to their stock which will cause shareholders to go nuts.