I switched from powerlifting style training to hypertrophy training in the last year, and I have found nothing but more enjoyment out of my training. It isn't to say powerlifting style training is bad, just that my ankle mobility is shit so I can't squat below parallel easily, at least not without an ultra wide stance.
As for hypertrophy programs, I make my own by following Dr. Mike, Dr. Milo and Jeff Nippard on YouTube. Here's the one I am currently going through: https://1drv.ms/x/s!AiiXzauoGwzRgx2Jzb45uzbzdWC8
What is functional strength? I remember a story where a guy was deadlifting and a kid came up and asked, "what muscle does that work?". The lifter asks the kid if he watches football, and the kid says 'yeah'. The lifter then goes, when you watch a line backer run across the field and hit a runner - that's the muscle the DL works.
As for hypertrophy programs, I make my own by following Dr. Mike, Dr. Milo and Jeff Nippard on YouTube. Here's the one I am currently going through: https://1drv.ms/x/s!AiiXzauoGwzRgx2Jzb45uzbzdWC8