YC is absolutely to blame here. Their standard term deal sheets are unnecessarily greedy and massively distort the cap table for hardware startups that have to raise a lot of money before a Series A.
Their docs are predicated on startups being able to raise a small-valuation Series A right out of the program, which is only true of startups that require low capitalization.
For instance, I'm out fundraising for a molecular nanotechnology startup right now. I will not be doing YC because it would be a shite deal for both me and my existing investors.