Having to adapt to shells is exactly why I don’t like to use radical shells like fish or nushell. I don’t want to feel too comfortable with them, because if I do, I would probably regret it when I’m stuck in situations that doesn’t have the correct shell. SSH into a new server or Raspberry Pi that has DNS issue, for example, which actually happened to me more than once. The DNS is already troublesome, and I don’t want shell unfamiliarity to become another headache

If you use zsh, there is zsh syntax highlighting plugin. For bash, a cursory search gave me ble.sh which looks interesting. And as other threads have mentioned, fish shell has this built in, but beware fish shell syntax works drastically differently from other POSIX shells