As it currently stands the only benefit to having a higher lvl in a profession appears to be using higher tier tools to gather higher tier resources. If I'm 80 smithing I should in some way feel like I'm a better smith than a guy with 20. I should be better at making pyrelite ingots/tools etc. than the guy at 20.
Maybe that could look like small chance for additional output or something? Chance to save the input resource? slightly better chance to upgrade a tool or something? idk.
TLDR: having a higher level in a profession doesn't feel impactful and that should change.