No question that there are players who engage in gamesmanship by exploiting injury timeout rules. They all have Shuzo Matsuoka to thank for the change in injury timeout rules.
The atp provides tournament doctors, physical therapists (trainers) and massage therapists to attend to player injuries. I’m not aware that psychotherapists are involved in on-court injury treatments

Perhaps Marat Safin could have called on them during his famous meltdowns.
Ultimately, it is, upon the advice of attending medical personnel, the chair umpire’s call to make. Woulda, coulda, shoulda. Many of us may not like how pro players are getting away with it, but that’s an issue for the ATP. I suppose it’s not bothering them enough to make a drastic change.
For club tournaments, dual meets and the like who don’t have the atp’s medical resources, it would be helpful if the rules for injury timeouts are made clear to participants before the start of the tournament. Make the rule simple:
Each player is allowed one 5-min injury timeout per match, after which the injured player must decide whether he would continue in or retire from the match.