They want to intentionally hamper the website to drive mobile app usage for more juicy data. They don't care about those users who fail to migrate as they are generating less revenue. They begrudgingly keep things working just enough to keep some engagement to drive mobile app use.
They don't seem to understand a couple key things, one of which is that if they can't make a website work, I will not install other things they make. They break trust.
Also why does reddit mobile site lag? Takes 5-10 seconds of the stupid icon before you see the text. Compare it to instant i.reddit or old.reddit.
Are they so incompetent that they cannot write a site that doesnt lag? Or they just dont care?