Michał Trojnara 
I've noticed that GPT-4 strives to maintain politeness, often providing positive responses, along with rationale, to both "Should I use <b> instead of <a>?" and "Should I use <a> instead of <b>?" This can be quite annoying.
It's probably obvious nowadays, but the proper prompt is something along "Give me pros and cons for replacing <a> with <b>". I use it a lot.