I say no
First, I would like to point out that such an innovation will help to better popularize Warcraft 2. Because among them there are many things that are so appreciated in modern RTS.
Further, no one says that all the improvements will affect personally the players who have played the game for 20 years. Moreover, the usual classics will definitely remain.
1. No need to speak for everyone. There are quite a few people in my environment who would like to see this opportunity in the game.
2. Now it is not necessary to use the old multicast, because when the same units are selected, the spells will not be lost, and you can all cast some kind of spell at once.
3. The Towerbug is still there. It's just that now you yourself can, if you wish, choose where to shoot the tower.
5. I agree, this is a controversial innovation. It needs to be run in.
6. Tests show quite adequate healing, and it really helps in battle. The bloodlust of the orcs is still stronger, but now the humans have the resources to oppose something to the orcs. (for example, if you catch an orc without bloodlust, then paladins with auto-heal will disassemble them almost in the same way as an orc with bloodlust of ordinary knights).
Don't jump to conclusions. We kindly ask you to test all this first. And then speak up! Let's not be unfounded!