I'm against all of the ones you've listed except the catcher visits one. We can do with fewer unofficial pitching coach visits. All of the others are non-starters that invite injury or a simple way to defeat the rule.
1) If a manager must use a pitcher for more than one batter, lots of LOOGYs and ROOGYs are going to become mysteriously injured after facing their one assigned batter...
2) Fine.
3) An easy way to defeat a pitch clock is to throw to the bases, at least with men on base (when pitchers tend to take the most time between pitches). Also, you may see some pitchers take more time than before because they have more time allowed than they thought. If the pitch clock is too short, then you invite more pitching injuries which would be extremely stupid.
4) MLB will shorten the game to 7 innings before cutting out advertising slots. I actually like decent-sized between innings breaks because: A) I have an attention span; and B) breaks are good for grabbing some food/going to the john whether at home or at the park. Forcing the players to change over quicker than they're accustomed, again, probably invites further injury especially for the pitchers.
And these rebuttals are without even considering most purists' main point--any of these things cheapen the strategy, the cat-and-mouse game, that most of us find so enthralling about the game to begin with. If we were talking about cutting from 3-4 hour games down to 1-2 hour games, this could probably be justified. But, when we're talking seconds to a few minutes per game, that's not going to change anyone's misguided perception of baseball being "too long and boring."
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