Maybe the next step is releasing TF3 or some competitor game to overtake TF2

I assumed this is what they are trying to do with Deadlock [0]?

[0] https://store.steampowered.com/app/1422450/Deadlock/

I tried playing Deadlock for a bit but it seems too much like an Overwatch clone. I like TF2 for it's simplicity and visual ease. Some of the current FPS games just clutter up the screen with soooo much stuff ... it's hard to see what I'm trying to shoot. Maybe I'm just old but having too much stuff on the screen is distracting and knocks my enjoyment way down.

IDK i've never played it

Why? TF2 looks and performs amazing.

TF2 definitely looks amazing, but it very much does not perform amazing - at least, not anymore.

Source really wasn't built for the amount of particles present in the cosmetics (especially the "Unusuals")

Ah, you mean modern cancer. Solution is to return to pre 2012 era, not try to bandaid disease.

They ported it to 64Bit proper last year, and that helped performance on modern systems a bunch! Of course, it's still a far cry of being able to run on the hardware of the time it came out in 2000.