Yes, limiting the number of turn-based games has helped me really get the most out of each one. I have had close to 40 games going at once in the past and it was stressful to keep up. At the moment, I am trying to keep my game load under 10.
However, I see some players who play hundreds of games at once and I think there is a benefit to that experience as well. No analysis board - pure visualization. Even minimal calculation. Let your sub-conscious analyze the position and play by feel.
Not sure I am ready for that experience, but I have considered loading myself up on games during a holiday and trying it. Problem is that, once you load up on games, it takes longer than a typical holiday to finish them all.
I have seen evidence of that as well when someone loses 150 games on time and goes from 2000 to 1000. Then destroys everybody in his path on his way back up to 2000.
It has made me think that the rating system should not allow a rating to drop more than 100 points a month or maybe never drop lower than 200 points below the all-time high. Although it does not happen that much so it is probably not worth worrying about it. Kind of annoying, though when you get knocked out of a tournament by someone who is rated 400 points below you, but has an all time high 400 points higher than yours. But that is another forum topic.
I play both Turn-based and Live Chess. Not surprizingly, my level of play is a lot higher in Turn-based as it appears to be for most, but not all chess.com members. Obviously, near unlimited time, the analysis board, opening books and game explorer are huge advantages for all, but especially those of us at the novice to intermediate level.
However, these advantages carry some hidden weaknesses.
Unlimited time has obvious advantages, but I have made mistakes when I lose the thread of the game and misremember analysis done in a previous session.
The analysis board can reveal risks and opportunities, but it cannot replace the vast review that a trained eye can see in scanning the board. I have run through several lines and felt like I thoroughly analyzed a position only to miss a bishop hiding in a corner quietly threatening a hanging piece.
Opening books and game explorer can help avoid a fatal blunder in the opening, but they can also cause you to take positions you do not understand and are unprepared to play. Leading to that lost "okay now what?" feeling when your opponent goes out of the book.
After playing a lot of Turn-based games. Live chess is frightening. It feels like walking a tightrope without a net. But, I believe it is vital to developing true chess skill. Moreover, I consider my Live rating as a more true measure of my ability. Of course, OTB is the only "real" chess. Looking your opponent in the eye and moving real pieces. Unfortunately, it is more difficult to find those games so internet chess is the reality of the chess most of us play. Live chess is much closer to real chess than Turn-based chess.
Both are good. Both are fun. Both help develop ability. But those who play only turn-based chess are only developing a part of their ability. At the moment, I play mostly 10 min Blitz and 15/10 Standard Live games. 10 min Blitz is still a bit fast for me, but 15/10 is reasonable. The trouble with 15/10 is that it can take up to an hour to finish a game and I often do not have a solid hour to devote to a game.
Turn-based is nice because you can make a move or two or analyze a position or two in whatever time chunks are available. Still, I think live chess is vital to development so I am trying to play at least a couple live games a week and I am focusing on my Live Standard rating as the measure of my progress.