It depends on how you define simple. I would say that the significant majority of options are quite simple, but if you consider simple to mean “I don’t have to remember I have it,” you might have trouble building a character with only simple options by that definition. There is very little straight numerical advancement from Feats. That comes almost entirely from level and gear, while Feats expand what you can do. Class Feats let you do new things with your class features, Skill Feats let you do new things with your skills, etc. You probably *could* make a character with very few special actions if you wanted to, but especially at higher levels it will be tricky to completely avoid taking options that you specifically choose to activate.