Most of what you say is accurate however it’s worth understanding that GTO really only applies in specific situations. E.g., heads up (2 players) play. GTO is unable to produce an unexploitable strategy against 2+ players. Additionally, as a matter of practical application, less of theory, GTO suffers in ultra deep stacked heads up play where effective stacks are > 500 BB deep.

NL Hold ‘Em has progressed a lot but it’s far from solved.