Onshore vs. offshore for hiring software devs?

I've got a bootstrapped startup with traction...

Am looking to open a permanent physical office soon and scale up the dev team, but real question:

is there any legitimate reason to stay domestic as if decoupled from any specific location?

when I can just set up shop in Tallinn Estonia or Warsaw and hire 2 eastern european senior for the price of a single mid level dev state-side?

As romantic as the entire team being in SF / NY / London, it just seems like an objectively poor financial decision

esp with a finite burn rate

...and even WITH funding it seems like a waste in terms of spend / quality output?

please tell me I'm missing something here