I think its the size of the burden. If you're creating a thing from scratch and are responsible for pretty much every single aspect of it from dev to sysadmin P

I think its the size of the burden. If you're creating a thing from scratch and are responsible for pretty much every single aspect of it from dev to sysadmin PLUS you have CTO responsibilities on top of that you just lose track of stuff and make the odd mistake. "I'll fix that a bit later" becomes "I have no idea what code is there anymore nor even the time to contemplate it". Perhaps.