/ic/ - Artwork/Critique

I finished Olson's course about 9 months ago (as well as Scott Robertson's book), and although I am way more confident than before (I keep most of principles in my head all the time) I'm still unsure how it's applicable when there's so many 3d tools around, with focal length, curves and stuff, does a practical 2d approach even exist nowadays? I've spent sooo much time with perspective, but now its either "draw what feels right" or "use 3d for overly tech stuff".
Seriously perspective is the most controversial topic for me, it helped a lot mentally but applying it the way it's taught nowadays seems obsolete

How do I resist the urge to erase something shitty I've drawn? I just want to delete everything I don't like.