Tony Vargas
Legend
The 3.x/PF rules do lavishly reward that sort of meticulously-applied system mastery, yes.Do the rules really encourage that style of play?
It's /also/ that, yes. I love doing a good build-to-concept in 3e or 4e or in other systems that are better for that approach than any edition of D&D, like, oh, Hero.Or, perhaps, is that just a style of play many people enjoy?

But 3e was probably the height of D&D for that style - it gave you so many options, so much flexibility, and gulf between an optimal and indifferent build was profound. In 5e, there just isn't all that much to do, and, in 4e, while there was a lot of choice and customization, applied system mastery didn't yield as large an advantage, you could have your perfect 30-level build, and you weren't overwhelmingly superior, indeed, might be /barely/ superior, to an ordinary character that grew to that level organically.
Are you kidding? Trap options are /key/ to encouraging system mastery, you need the stick as well as the carrot!I have frequently seen Pathfinder criticised for its many "trap options" that were supposedly underpowered. If Paizo were all about pushing the perfect build on the bleeding edge of optimisation, why would they publish so many "traps"?