Well, reliability does not just means "there is no neighbor who cut my aerial lines", means also normal performances with congestion, high RTT etc. While many jobs does not need special performance we still have many VoIP annoyances here and there, dropped frames from a video call, bad audio sometimes, the impromptu need to transfer a big amount of data as a normal thing like "ok, look, just download this 1Tb archive" etc.

Noise cancellation is remarkable these days but you can't work for a whole day with some headphones on you NORMALLY, it might happen, I think almost anyone here have experienced that but a day it's a thing, every day it's another. I've felt the pain of some colleagues with their laptop while they have rejected the idea of a proper desktop setup stating how nice it is being with a tiny laptop in the garden etc, yes it might be some days, but not every day. Every day we need comfy chairs, standing desk, a good keyboard a good monitor etc.

Many push against remote working are for real estate business and a certain economic model reasons, many others are for mere reactionary ideas, but some of them have good points about "way too many remote workers are not engaged, have little attention, are hard to find" etc and those in most cases are people with such "mobile setups" as their normal way of work.