Title says it all but if you are unaware, currently artifacts, grenades, and shields as well as class mods currently do not scale to the mayhem level you are playing on. They only scale to your level. The loot that comes from chests also have this issue which makes all weapons you get from chests obsolete even if it is a weapon with a really good anointment which is pretty disappointing.
I know player builds and weapons are getting really strong now but the challenge mayhem 10 brings is a pretty hefty one and weapons alone will not be adequate enough to make playing on higher difficulties something you look forward to doing.