It is just a vitamin compared to other things companies/people are paying for. Nothing wrong with being a vitamin (you can be vastly successful) but it’s the first expense that is going to get cut in a recession.
There are some business models that are attractive when capital is cheap, but not so great when the tide goes out and you suddenly have to be a real business, because capital is no longer freely available. I would propose that this is different than the discretionary businesses you describe, that are sustainable outside of extraordinary economic circumstances.
You can see this in action with the healthcare system in the US, being dependent on your employer for healthcare gives them a huge leverage over an employee, business (on average) will always fight against policies that remove their leverage towards a more equal field.
Tech just has more non-essential, nice-to-have companies than other industries.
https://en.wikipedia.org/wiki/High_tech
Particularly the cited reference, the OECD definition:
Hatzichronoglou, Thomas: "Revision of the High-Technology Sector and Product Classification", OECD Science, Technology and Industry Working Papers, No. 1997/02, OECD Publishing, Paris.
https://read.oecd-ilibrary.org/science-and-technology/revisi...
Page 7 specifically divides industries into four technology levels, high, medium-high, medium low, and low.
Given J.S. Mill's wonderful definition of technology, 'the study of means", there's little in human activity which is ccompletely atechnological. There remains, however, much that is quite some remove from the cutting edge.
In the technology adoption lifecycle, high tech are innovators. An early-adopter firm is itself still not high tech itself.
https://en.wikipedia.org/wiki/Technology_adoption_life_cycle
I don't think they will ever represent "most tech companies," though.
I personally wouldn't be that harsh. IMO, I used to come across a lot of founders who just didn't understand the point of running a business.
It's an easy trap to fall in when there's lots of investors looking to put their money and willing to work with 1 in 10 success rates.