I could make a case for every camp to be guilty of this. Guys like GSP, Belfort and RMcD are so complete that they give this image of jack-of-all-trade. Plenty of fighters have come of tri-star with fighters who have clearly a predominant strenght, like Alex Garcia and Nordine Taleb.
every gym tends to have a "template" of what kind of fighters it wants to produce.
Kings wants to turn BJJ specialists into killer strikers
AKA produces pressure wrestlers
SBG wants turn everyone into McGregor (99% of the time, that stuff doesn't work)
Jackson-Wink wants to produce weird*ss rangy kickboxers.
Outside for the weird obssession to become leg lock specialists, Tristar lacks an identity that goes beyond be well-rounded. Taleb IMO has turned into a pretty decent jack-of-all-trade fighter (i'd even say he's a poor man Rory Mac. funny enough both their last loss came from ill-advised leg lock attempts) and Garcia doesn't seem to fit well with the camp and the results seem to show.
It's a question of what kinds of fighters fit in what kind of camp. I'm not sure Tristar is a good fit for many type of fighters.