I hear what you're saying. I mean to me that's no different than Thor hanging out with Hawkeye and Black Widow and even Cap (although the MCU seems to have made him much stronger). To me only Hulk, Iron Man, Captain Marvel, Wanda, and Vision are really on or close to Thor's level. Drax has been under utilized but he has been shown to have some insane durability (the GOTG2 space travel sequence with him tethered do the back). Gamora is clearly enhanced. Groot can hang. I very much enjoyed Thor, Groot and Rocket on the battlefield of Wakanda and that's probably Thor at his strongest in these films. I still think they can make it work with a fully powered Thor and really won't be on board with something else. Surely they can keep Thor busy with a foe on his power level while the other Guardians do their thing. If they don't want Thor to be Thor then invent a new character I guess.