There's worse things you could do with your time.
I'd say it's better to look at things from the perspective of building strength, as it's a bit more linear and controllable than building muscle. With strength building, your results are easily quantifiable by more weight on the barbell, or if training for something athletic, better sprint times, jump higher, etc. But with training for muscle, your results are much more subjective, and I think much more genetically limited. Maybe that's a bit fatalist of a thought process, but some people are just better cut out for it. Look at, say, random people in Africa or something. A lot are more muscular than steroid using gym goers in the States even though they eat like 50 grams of protein a day and don't "work out." So in that regard it's better to save your sanity and just work for strength and athletic gains and take whatever comes as far as muscle gains.
But eh, it's fun. You can pick up normal everyday things easier. Carry groceries better. Pick up car parts easier. Jump higher. Sprint better. Girls smile at you more and are more attracted to you. Guys talk to you much more respectfully. You have a bit more slack in your diet from the muscles repairing themselves using more calories (and a tiny amount of increased BMR from more muscle mass.) For me my eye contact has gotten better without me having to "work" on it, so either I'm more "confident" or my hormonal levels have gotten better from lifting thus leading to more "confidence." Overall it's not bad. Not magical, but it's a good hobby.