They may matter like you say in other systems, but they are not the same in all systems.
https://www.theguardian.com/law/2022/oct/06/rise-of-plea-bar...
"Rise of plea-bargaining coerces young defendants into guilty pleas, says report. US-style negotiations for reduced sentences in England and Wales raises fears of false confessions and lack of informed consent"
https://www.theguardian.com/law/2022/oct/06/rise-of-plea-bar...
"Rise of plea-bargaining coerces young defendants into guilty pleas, says report. US-style negotiations for reduced sentences in England and Wales raises fears of false confessions and lack of informed consent"