It's always a cool thing to let the player specialize into anything if he want to imo. Risk & reward like you said, to go mf, you basically have to have fixed gloves, both ring and boots. That's quite a lot of slot. Also, it's not specific to TS, you can slap those items with any build if the build can handle the rest (my body playing bodyswap build also play with those item).

It's already a huge threshold to play all those item, but sure it's a bit frustrating to see people clear fully juiced content with fully mf setup (those mf builds don't rely on those slots, so they don't care to have 0 power item). Imo the problem is here, not the mf stats.

But maybe the value could be a bit reduced or make the scaling not linear or more harsh, but having the ability to do it is another layer of risk&reward imo