Old drawing to look at or not

[darktiste]

This post is to determine the pro and con of doing a study on your old drawing.To look at the error and maybe revamp the projet...

Pro:
1.Review progress over time
2.can point out error that are recurring in drawing we made(need awareness of flaws)
Con:
1.can be bad on the mental
2.waste of time due to lake of knowledge(can't see the flaws properly)

please help me out on the pro and con