Toyo - I think you have some good points about those things. For chat, its good option that you can block it, but its to late if someone abuse it first before you do it, and its seems to not be ok to just block it on start. but who knows..
About pause your right.
Also, why is there so much time for serving? Bad players are abusing it and waiting whole time to pass for serve while you are just waiting there.. In some games they spent over 5min just letting full time for serve to pass on for every serve, why is that good option?
I see players using it just for abuse and other not fear motives, didn't see good and fair reasons for using that time, in my playing experience with other players.. so can that be fixed?
Last, why is there ability to applaud your opponent after their mistake, or to do similar gestures that are unappropriated for given situations, they only use it for bad reasons, and that ability always give players that are willing to provoke their opponents ability to do that, I didn't see anything good come of it.
What I am asking is why is there such an option -> from which nothing good ever came?
I understand if you want it to be realistic, but this is not at all realistic, it doesn't happens in real tennis, eventually sometimes pumping fist after someone miss, but that is all, and it doesn't happen after every point, its just abuse.. Creating bad environment for this really great game - giving it bad elements without any good reason.. that in the end can replace and suppress all those good things about this game

It is ruining good experience in playing this game, that without it would be simply great.