Crusty Old Meatwad (he/him)
You're just repeating what I already replied to? If you do that, then the subclass often no longer functions if you take more levels of it because you will be lacking a core element which increases in power at a later level.Just limit what you get from the subclass at 1st level.
Example: Earliest subclass ability grants +1d6 damage once per proficiency bonus a day. Middle subclass ability changes die to d8. Later subclass ability changes to recharge on short rest. If you limited what you could get at earliest point, none of the rest of the subclass functions. And if you have to tinker with how it functions to make this work, then you have to do that for every subclass in the game and now you have a chapters worth on multiclassing. This is not a workable core system element.