That time would still be very much wasted.
If you extend your timeline, you may find that you get bored or restless and want to change things up. That "wasted time" is necessary in order to get into a different headspace. It's the equivalent of riding an elevator for your brain... It takes you to a different stage of life.
I wish I’d gone to therapy or done literally anything else. It took years for me to finally feel disgusted enough with myself to make any sort of change and I was a wreck when I did. I’d barely improved at all, if not gotten worse than I was when I got emotionally messed up at 19.
It becomes problematic, for me at least, when the thing i enjoyed becomes a sort of default mode. No longer for enjoyment, more of a reflex. Then it feels like it might be wasted.