Why isn’t it standard for fighting games to have an option for controller input overlay during matches or pin inputs?

Title basically. I think it would be better to have newcomers enter fighting games without needing to get rid of motion inputs and new players would find it easier to learn inputs with an overlay like in training mode. Then new players would be able to practice inputs in game instead of spending it in training mode which is what usually turns off newcomers. i don’t know if any fighting games do that since I haven’t looked for that option but I’ve never seen anyone talk about it so I assume they don’t. Another thing is pinning special move inputs to the top of the screen like in mortal Kombat. I don’t know why that one isn’t standard. The Pin input thing is so useful during parties where people don’t know how to play. Both of these things would make it easier for newcomers to learn while playing so why doesn’t it happen instead of removing inputs altogether?