Generally it’s the method of production that dictates if it’s too close to the edge. Production houses are accurate and can run close, home DIY etching depends on your skill.
The DRC makes you aware of problems, but it’s up to you to decide if it’s ok to ignore.
Other hints
Generally nobody uses 90º bends in their traces anymore, they are all 45º elbows now. It can cause resonant frequencies.
Generally nobody uses auto route because it’s not smart enough - it’s a legacy from the 80s when everything was vertical in one layer and horizontal in the other -.
This is all hand routed
