[omnimus]

I am not sure if you are joking but there is whole set of techniques called fluid typography that does this (using css math functions mainly clamp) https://fluidtypography.com/ It's not a silver bullet and many people simply don't prefer it to having a few breakpoints (that includes me too).

[tiffanyh]

  font-size: clamp(3.125rem, 3.464vw + 2.229rem, 5rem);

From their website, this is not easy code to maintain.

It’s not obvious how to increase/decrease the font size at a later date.

[wonger_]

I prefer this tool: https://utopia.fyi/type/calculator

It generates step size variables and a comment linking back to the web calculator filled with your values.

[todotask]

Virtualization tool may help.

https://modern-fluid-typography.vercel.app/