And yet, has anyone ever claimed regular marijuana use improved their memory?

Ok fine, I'll chime in.

No, it has not improved my memory. Though, I am not really certain anything does. At least, not permanently. Though, I will say the effects on memory are rather complex. Some diminished abilities in some domains, but oddly some enhancements in a select few domains.

I am 'neurodivergent' apparently, so my experiences might not be worth much.