Says you.
Specifically: disabling JS - your choice; having a disability - not your choice.
Assuming you have a new enough device. My 300€ android from 2017 is essentially unusable as it can't run JS well enough any longer.
Your 2017 Android isn't unusable because it can't run AJAX and $(dropdown).toggle() fast enough. Maybe it's not as fast as your laptop.
With JS enabled, I sometimes see simple mousewheel scrolling slow down or become choppy, or spiking CPU usage for a second or two. Simple scrolling of content that is already rendered and is not moving. And often, the same site with JS disabled scrolls smoothly (or completely fails to load, it's a crapshoot, really).