Some immigration offices have different requirements, ie Nonthaburi wants 3 photo copies of passport pages each 90 days, but obviously not needed if I do it online.
I expect driving license offices have varying requirements as well which is frustrating.
I concur with everything you say. No insurance required and never use an agent. Just pay 1900 baht, Jump through the often unnecessary hoops, and only get re entry when required.
I was due to go uk in April 2020 but the Chinese virus put a stop to that.
Still not gonna go back til easier to enter Thailand