weapon proficiencies made a big difference in 3.5 when it meant access to different (meaningful) damage types, different crit ranges, & different crit modifiers. in 5e you either use weapons 7 after picking heavy/finesse/ranged you pick a die size and either deal nonmagical b/p/s or magical b/p/s... alternately you never use a weapon as much more than a shovel because you use cantrips. The weapon proficiencies don't change any of the meaningful values in 5e. Changing a simple/martial weapon for a different simple/martial weapon is a virtually meaningless distinction because every weapon using class with specific weapons proficiencies rather than "simple weapons" "martial weapons" is limited in weapon choice by a feature like sneak attack or martial arts. Even switching them for tool proficiencies under tcoe changes is of extremely minimal benefitGiving the V human the bonus feat was to compensate for the other races getting bonus weapons, abilities, spells with the restrictions of where points are distributed. With that eliminated and the other benefits of gaining more skills/tools, it’s very apparent the gap has dramatically widened
Giving variant human a feat was justified back when those weapon proficiencies were a significant benefit & you still had feat chains, when they overly simplified the weapons to "pick your damage die" and condensed the feat chains it threw off the math. Variant human does not need anything until wotc brings up the losing races to be on par with winning ones like variant human & mountain dwarf.