You wouldn't pick someone who ended up a Uber driver, because they dont look to you as someone from your field to model your future on.
Ultimately, getting fired can drastically change your life. Either for the betterment or detriment to their lives.
You're speaking from a position of privilege.
Sure, a considerable number of people (If not a majority) here on Hacker News are decent earners and likely have enough savings to ride out a job loss for at least a few months.
But I recall my days while I was working a fast food job. If I lost my job, unless I found a new one within two weeks, I'd be homeless. When your paychecks are just barely covering the cost of living and saving is impossible, then getting fired is a genuine fear. It means losing the roof over your head and the food from the table.
It also means (in the US) you lose access to your healthcare.
And in some cases, especially in our industry, that the funding ran out.
These days it is much harsher, if you are not socially accepted or liked, you are out of luck, your skill doesn't matter in their eyes, until... it does again