Earlier quoted context omitted.
The TailScale folks caught a bunch of flak for their "do things that don't scale" approach to databases. But, honestly, most startups would be better off following that approach than what Fast did. Sounds like the engineers were just entertaining themselves with shiny toys rather than solving the problems they actually had.
I've done startup engineering for a while. I've seen exactly 1 issue that we couldn't solve easily (N+1) or with simply turning our server count up (often way cheaper than putting an engineer to a problem). Basically, to move development velocity faster we "load everything". Seems like a really bad idea on the surface. In practice, we only ran into an issue with a single customer that was literally 1000x as large as…
If you can make the problem go away by spending more in servers always do it.
For startups, the life and death is product market fit and you only get there by iterating on the business as many times as possible, not making something more efficient.
Put engineers on business iterations.