Just my advice, I would largely ignore the situation, and just take the overall advice that trickles down. For instance, one major advancement of the solvers was figuring out which part of your range to bluff with. There are advantages and disadvantages based on card removal--this is common knowledge now, but nobody had come up with it 15 years ago when I was a pro.
Anyway, it's still not best to play like a robot in live low stakes games, which are probably what you're going to be playing. Exploit the shit out of your opponents. GTO has some good concepts that are easy to implement, but I'd work on studying your opponents and the mistakes they are making, and decide how to capitalize on those mistakes.
If you are going to multi-table online, ignore everything I just said and become best friends with some solver software.
The problem with this advice is that solvers are one of the best ways to understand how to "exploit the shit out of your opponents".
Piosolver has several features that lets you emulate how your opponent plays, such as "node locking", that "lock" the game tree node to the strategy you suspect your opponent plays, and shows you how to maximally exploit it.
Otherwise, what is your exploitation based on? Certainly some people have great instincts for the game, but it's just untrue that solvers can't help you exploit weaker players. For example, if you're on a given board and a given river and an opponent makes a big bet, if your opponent bluffs too much you should call, if they don't bluff enough you should fold. But the solver teaches you how often they should be bluffing and thus what "too much" or "not enough" even means.
This is why I prefer the term "theory-based" to GTO, since the point of studying GTO is not to play GTO but to develop a better understanding of the underlying mechanics of the game.
Before solvers people still implemented strategies, so I'm not sure what you mean when you ask what my exploitation is based on.
I think GTO is a great way to think about the game. I don't think studying solvers is important to understand the game well, or GTO. When solvers provide an insight, it generally trickles out to the poker community and we all hear about it. It's much easier to digest traditional educational content than to futz around with a solver, and a much better use of time for a new player.
There’s not much else to say other than you’re wrong. People tried their best before solvers, then solvers came along and people who didn’t keep up with them lost to people who did. I think it’s possible for people to win without studying them because of a combination of soft games and natural instincts, but the vast majority of good players these days do solver work. If your brand new, having an experienced player distill some of those concepts is helpful, but if you want to be good you might as well start doing the things good players do sooner rather than later.
Anyway, it's still not best to play like a robot in live low stakes games, which are probably what you're going to be playing. Exploit the shit out of your opponents. GTO has some good concepts that are easy to implement, but I'd work on studying your opponents and the mistakes they are making, and decide how to capitalize on those mistakes.
If you are going to multi-table online, ignore everything I just said and become best friends with some solver software.
Good luck.