Mannahnin
Scion of Murgen (He/Him)
All of this.The only real issue with this argument is that it applied just as much, if not more, to 3e, and yet relatively few people complain about high-level 3e/PF1e fights taking for-bloody-ever to resolve.
That said, I do agree that 4e could have been significantly tightened up in this department. It's a game that benefits a lot from having a VTT. If it had come out 2-3 years later, or had offered a really really robust VTT option (e.g. something to legitimately rival Roll20), a lot of the issues would have gone away. Doubly so if they'd made all PHB1 options free to use for "trial account" members or something like that.
Apart from the VTT side of things though, using MM3/MV math, placing some reasonable limits on off-turn and reaction stuff, cutting out unnecessary dice rolls, and overall "streamlining" the process of play would have done a lot to improve the speed of play without meaningfully affecting the rich tactical experience.
I have strong, sad memories of how long and slow high level 3.x combat could get. Of course part of that was my groups usually having 6 players. We played in the neighborhood of 5-6 multi-year campaigns up into the teens (I think our highest around 18th?) of levels, and those high level fights did get to be a terrible slog.