I mean, I've seen you on here enough to know that your brain trends towards negativity and that there's a solid chance that if you put the time in you could get somewhere with it, even if it's just average.
I'm not saying everyone can just be Eddie Van Halen, I'm also not saying that you should just bash your head against the wall and learn if you don't want to, but learning the basics of guitar is not intellectually difficult, it just requires dedication, and it's cool if you like the sound of guitar, but don't want to learn the technique, (which isn't musical at all, it just ends up producing music).
Life is hard enough as it is, try not to be hard on yourself.
I'm glad that you enjoyed this game! Some of your reactions to the characters' fates took me back to when I played the series on Vita haha. It was also nice to see you mention the extra stuff like Distrust.
I will warn you now, if you are playing the trilogy through on the Switch's Decadence Collection... V3 is poorly optimized during certain class trial sections and I actually struggled to complete some of the mini games because of how laggy it was (when it ran perfectly on the Vita). It's possible they patched it since I played it after the first or second patch, but keep it in mind.
It is still doable, but it's a bit of a shame because I love this series. I hope you enjoy Goodbye Despair and V3 provided you complete them as well!