These are impressive photoshop-detective skills right here. Respect.
The reason mids are on the out isn't because they're inherently better or worse (as some on this forum would stubbornly have you believe), but because the general public at large has realized the difficulty of playing with them, and wants something a little bit easier to use. I'm a high level player and I've done the exact same thing, going from the super flexible small sweet-spot 315Ltd to a 98 sq Yonex to help me reach my tennis goals. What's more, when set up properly, some of these more powerful midplus racquets can play with really nice feel and touch. I've worked in a tennis shop and sold/strung many racquets, and even when price isn't an objection (as it wasn't for many of our customers), I can probably count on one hand the number of people who would knowingly buy a racquet that is difficult to play with and requires them to be "on" with their footwork, technique, and fitness close to 100% of the time. Most people know they're not professionals, and just want to go out there, hit a few nice shots, and have a good time. I say whatever gets people on the court is good.
I'd be cautious to say "they've been proven to correlate with winning tennis" because that's just confirmation bias. Just because Fed dominated with a PS90 and Sampras with a PS85 doesn't mean their racquets were the cause of their success. Those two in their prime would have dominated with anything because of their raw skill and ball striking and mental ability. And look at the life the 97 has breathed into Fed's game at 33-35. Injuries aside he's competing with the top 5 in the world with basically just his serve and occasionally his forehand as weapons, as compared to his prime where every shot was deadly. Could he do it with the PS90? I'd say probably, but you never really know.
Lopez is great fun to watch, I agree. Imagine his work ethic and willingness to go against the grain, growing up in the Spanish system with his kind of game. I bet as a kid he had tons of pressure to switch his backhand up and become much more of a grinder. Great fun to watch though. I think he has one of the best serves on tour.