I already adressed this. This is what the devs also said on the topic:
“The original class [The Zealot] was designed to showcase the melee gameplay and provide a familiar home for our Vermintide veterans. Equipped with a stun grenade and a charge ability, it allowed for an aggressive get-stuck-in melee play style that could bypass the ranged combat and lock the heretics in glorious melee combat.”
Source: Talent Trees Deep Dive
Clearly it is factored into the design and fully encouraged. If you want to play all ranged or melee, you can and it works.
Note the use of language, too. Bypass the ranged combat, they said. The opposite obviously is also true.
Who says they can’t feel good when balanced around other factors but the ammo pool?
Where is your creativity? 
Not similiar to Darktide.
What I immediately was thinking of was Overwatch. You have infinite ammo in that game, only the clipsize is the limit. The game is entirely balanced around Time to kill, reload times and “convenience vs power vs utility”.
My point is: You don’t need ammo limits to make a compelling shooter. But obviously an ammo reserve is enhancing survival elements in game that tests endurance.
It fits Darktide obviously.