What have I compared? 

I did say immediate payment was industry standard, and then I suggested people simply have a think about how they would work with a system like that, but taking into consideration all of the tools eBay provide when they do.

I had to think about how to make it work, when I started selling on another site that requires immediate payment, and there were far fewer tools available to me to allow a decent amount of accuracy in the postage calculations. As did many other people who sell things of vastly different weights and sizes. 

My actual point is, eBay's postage and payments system is / was imperfect even without all these new issues, but the workarounds are so normalised people don't see them as imperfections but rather standard practice, so when something new comes along the imperfections suddenly seem dramatic and the workarounds a complete burden to even think about, so "can't do it like this" becomes an unneccessary stumbling block. Just having a think about how someone would use eBay's tools to their advantage with immediate payment in play - I think - is a constructive way to try and overcome that way of thinking.