Check out the whole article at:

https://courses.coachbachmann.com/you-dont-need-to-be-flexible-to-handstand-but-it-will-help/

Learning to Handstand is hard. As a coach it is my duty to help make handstands as easy as possible for you.

Big picture there are 3 ways of how you can make handstands easier. You can either get strong as a bear, you can perfect your technique or you can create mechanical advantages through flexibility.

Just like any door that says pull opens by pushing if you apply enough force or you can theoretically make water boil by rubbing the cub you can also press to handstand without any flexibility.

All this is possible. You can do handstands if you are completely stiff but will it be efficient? I think not!