alt Hacker NewsMembrane is not inherently more ergonomic, the "much less pressure" seems untrue since apparently it takes 50g of force to activate, while you can easily find switches that activate at less than 30g (I used a 37g switch myself).
About travel distance, this is also something you can adjust, with the low profile switches having less than 3mm travel distance.
Heck, even HE keyboards can set their actuation down to 0.1mm, if that's your thing.
Yeah you could probably customize a bespoke keyboard to match it. That said, the result would be pretty similar, for a lot more money, and time.
As I said, it's a hobby - I built one myself, it's nice, but the whole "ergo" aspect seems more a consumerist justification than a real concern honestly.