Why is ChatGPT still useless at the most basic tasks so many years later?

Just bought a ChatGPT subscription and i'm stuck on the same problems as 2023? ''Take this text and remove uhms and ahs but without changing any other content'' (with hyper specific prompt with rules and everything). Bam, gives me back half the text because it edited out half the content. Endless fighting. ''Here take this glossary and put it in a list'' Oh sorry i removed half the terms and explanations because fuck you.