I think “rush” is the word I’m pushing back against here, by describing the decision as a function of time, with some impact the decreases but may never reach zero
If we said we were planning to do this in 1 year from now vs. 1 month, does that feel like a rush?
Assuming I can ignore that word for now and reframe the question without it:
What’s the [reason for] implementing new features that demand newer browsers? Why not always have a graceful fallback?
It’s about cost, and the relative value of doing this vs. doing other things.
Implementing those fallbacks would take attention and time. And maintaining them would do the same. That’s time and attention that isn’t available for other things.
It may be something we consider in the future, but at the moment, our assessment is that we have to make some tradeoff here.