OniDax

You're not the only one. But DE wanted to get rid of us using fire input for melee when they introduced Melee 3.0. Backlash pushed them to add the feature back as a settings options (when previously, melee by default worked that way when you had melee equipped - versus doing quick melee). It's looking like they've used Duviri as a way to remove that feature from players for the Drifter. They likely didn't intend for it melee to work with fire input at launch, and quickly removed it in their first hotfix.

[DE]Saske said DE is investigating here (just found that by the way), but it would be nice if they'd acknowledge it as a Known Issue in these hotfix notes. It was already frustrating waiting a long time for them to implement this back when they introduced the (imo unnecessary) Melee 3.0 (which took away our ability to use melee with our fire input). It's frustrating seeing that once again DE adds a feature that interrupts the ability to use melee in that manner.

DE can do better with Warframe's gunplay and melee gameplay (Warframe and Drifter), imo. I don't think it's simply a matter of difficulty, but of gameplay mechanics and movement/animation. I'd rather see a melee system that can rival Ghost of Tsushima (basically, improving even further on Duviri's combat system and expanding it, applying it to all melee enemies): And this quality of gunplay, and movement animations, but with Warframe's speed and enhanced movement system (bullet jump/glide). And sound design:

Do we know if it's a bug or a feature at this point? When they introduced Melee 3.0, they didn't have Melee as Fire Input as an option, and it took them quite a while to add the ability to use left mouse click as melee.