I would definitely love to see more selling all around and more pick-a-part psychology from technicians and heels. Wrestling has definitely evolved a bit over the past 30 year, but those two specific storytelling methods should be standard issue for almost every match. There are still plenty people who do it, and unless the story is centered around attacking a body part or selling a previous injury, it doesn't always have to be a necessity to a match to milk every single move of offense with prolonged moaning and groaning, but if you do start to sell an injury like it's a contributing factor in your potential downfall then you should keep it up the entirety of the match. I have nothing against a babyface comeback, or the idea of adrenaline taking over, but if you paint a bullseye on your knee and come back with a vengeance, if someone kicks out that knee it should be an immediate momentum killer.
Ironically the last bastion of this type of storytelling for me has been coming out of Japan. Moving up from the juniors to heavies, Matt Jackson was constantly selling his back and never really neglected to make it known that he's in pain. If he tried to go for signature offense that was impact intensive on the lower back, he'd sell it. Likewise, over the last few years it seems like Tanahashi comes into every tournament with a bad limb that's there to be exploited and change his game up in-ring. On the American side of things, Dakota Kai would probably be a white hot babyface right now based on her program with Shayna constantly targeting her arm and bullying Kai until she finally had enough. Ironically, a leg injury put her out and I wouldn't be surprised if it's a target of interest when she does get back in the ring in coming months, and I'm sure she'll sell it in the most gloriously uncomfortable way.
It's trivial to play old man and say that this generation of wrestling, or at least most of it, took the wrong things away from their heroes. The entire 2000's was filled with indie darlings who wanted to be Steve Austin, but without the steeped on opposition or star making moments where Austin got in a bit over his head. They just wanted the badass aspect without the common man worries and woes. Likewise, everyone wants to fly and kick like Steamboat, or be a textbook marvel like Bret, but they don't want to bump or sell on the mat for a solid 3 minutes like those ring heroes that they cared about because of the peril they overcame. Maybe it's part of the whole innocence lost era of being a professional wrestler and wrestling fan, but I'd definitely love to see more storytelling and selling. People are afraid of ever looking weak though, or again, at least for the most part. People trash Orange Cassidy constantly, but he's had some of the most intense underdog battles against the likes of David Starr and even Velveteen Dream that no one really talks about when they talk about the hungover looking frat goof who can dive and kip-up with his hands in his pockets. That's kind of telling about where our priorities are as fans.