Jolly is speaking from a complete player perspective with a positive attitude that facing the issues and fix it. It is the right mindset in my opinion to improve as a player. Practice rallies are meant to practice things you are not good at, and find a way to fix it so you can practice to be used in your real matches. However at the same time, you can't just be like, oh because I'm bad at 1-2 things, so I'm going to assume that's how pros are doing it.
Don't look down on Dimitrov btw, he is really really good and he can finish any short balls and close the games 10000% better than how you would ever do right now. Both Nadal and Dimitrov are very complete tennis players, normal 5.0, 5.5+ can't win them no matter what they do. Dimitrov is always playing at the highest level of tennis, that's why you see his flaws, it is only because those flaws are shown when playing against top players such as Federer, Nadal, Djokovic, etc because they are all geniuses/monsters!
And the reason why Jolly said you have distorted view is because, you can't just use that you thought is the weakness of those players, compare that to your game. Those pros are playing a very different game than what us rec players play at. Jolly should be able to agree with me here, the speed, spin and the angle and accuracy at the high level is just so hard to bare and so hard to return even if they hit straight at you, and now imagine you have to do the same to your opponent while running around for over 1-2 hours.
So what jolly is saying is that, you should stop looking at the pros, and stop using your distorted view of tennis game, and really try to start from the fundamentals. However if you don't want to improve, which is fine, then don't argue back when you know that for players with incomplete skillsets, they can't execute optimal strategy as they lacked options.
For example, I used to have similar distorted view where I keep complaining that everytime I serve "too well", my opponent will always return "to well" that lands always on the baseline and next to my feet and I just can't return it, so I thought maybe I shouldn't serve "too well", because that gives me less time to prepare for the return. I should serve slow. If what I said is true, then I would never improve my serve, since the reasoning is limited based on a lot of wrong assumptions, and if I don't see it past my wrong assumptions, I will always concluded the same.
There is even one time when I was just started tennis, I thought those 50-60 year old slice and continental groundstrokes are well too good, as it skid through the surface and always land in, and my groundstrokes are not good enough to get past them, I once thought that is what higher level tennis looks like. Of course we all know this is old school and not what high level tennis looks like, but this was how I saw tennis, of course now I can easily beat those old geezers without even trying.
Perhaps your viewpoint will change once you improve your skillsets and play more tournaments, but I believe a lot of us is trying to help save you time to not thinking like this for too long so you don't waste your time thinking the distorted way. We are all trying to help you out.
Esp. Jolly, to be honest I think he is really really trying to help you, he doesn't have to go all that time to write that response down.