There are probably less than 20 YC companies that have reached the point where this advice is valid. Zenefits, Airbnb, Dropbox, Stripe etc.
The others never needed this advice. The nightmare scenario for employees is getting stuck at a company without true product/market fit that just sort of has it, then watching the founders justify following this advice because they have raised enough money to get to 30 employees without ever having true product/market fit.
> The cases where a company is so compelling and viral that there is a clear path to scaling are the exception.
IMO, this advice should only apply to the exceptional companies.
> For every Instagram there are probably 1000 companies that are still considered successful by their founders but at a smaller scale or slower pace. Startups are hard.
Those companies should stay small with no formal management structure and most should not follow the advice in the post, even if they have scaled.
I think the OP's point is that product/market fit is overlooked so often by founders and teams. No matter what, it should always be the true focus of the business. The number of companies that need the advice in this post is so small that YC should just write it as a personal email to founders.