Probably to game at all, on some level it bothers me that I've spent so much time on what is essentially a childish pursuit. I actually didn't do that much gaming between 2003 and ca. 2012, but then started again. It's probably no coincidence that my "career" took a nosedive in 2013 from which I haven't recovered and may never recover.
I tend to think that if it wasn't for gaming, you would have used that same time to some other sort of escapism, be it TV, movies, social media, drinking yourself silly every other day...
So I don't necessarily believe gaming is necessarily the reason, but a consequence. Even if you had no gaming devices or any games, you (you in general including me, not you you) still would have probably spent that time to some other "unproductive" past time, not studying and inventing cure for cancer at your work.
Frankly, if I think what is taking much more of my "productive time" (which I should rather have used for studies in the past, or work now), is internet and online discussion forums. I mean, right now I should be re-registering a domain for our client and creating their DNS zone, but here I am talking shit to you people. I'll promise to do it right after this message, unless I go to check some Youtube videos first...
At least nowadays gaming doesn't really take time from me from e.g. work (internet, youtube etc. in general may do so). I usually play games later in the evening and nights and weekends if there is nothing special to do, and it is mainly taking time from other useless activities like watching TV, or writing to GOG forums.
Also, while I do feel I should do more physical exercise nowadays to stay fit (my belly is growing), I don't feel bad about my gaming habit. At this point of my life, I feel that if it is bringing pleasure to me and I find it interesting, then it is a positive thing. As long as it is not drugs or some other really harmful thing... So in essence, I don't consider "escapism" to be a bad thing at all, as long as you get your normal chores done and remember to wipe your butt after taking a dump. Reading a good book is "escapism", and no one seems to say it is a bad thing.
Sometimes I think I should have tried a console or maybe a handheld. As I explore emulation some of the games I come across surprise me from what was available on Sega Master System to PSP and Dreamcast. Then others have pointed out that I'm playing these games with new features that I use often like save state and advanced filter options.
Stayed away from consoles due to their expense and back to back bad arcade ports but maybe I should have tried the other stuff when I was younger.
But then you would be wondering now whether you should have tried PC and computer gaming when you were younger...