Even then, you don't have to throw money at the problem right away. If you feel you can save time and money by using Rust instead of PHP (just using the two languages as examples, not a specific indication of Rust or PHP's resource drain), go ahead. Making that decision early on costs nothing.

It's only after a project is off the ground that caring about these decisions winds up wasting everyone's time, that's when you wind up slowing momentum tremendously due to dangling a potential new toy in front of your team.