What’s the most number of hosts you’d feel comfortable on the same broadcast domain?

What’s the largest number of hosts you’d set up on a network before being worried about broadcast storms, etc.

I have a client wanting to connect 2190 devices to 45 or so dumb TP-Link 48 port switches. Those dumb switches will be uplinked to a layer 3 building core switch that is then connected to other buildings and to each dumb switch. Between all buildings will be approx. 26,000 devices. PfSense routers in each building.

Am I incorrect in saying that even 2190 devices is too many hosts on a single broadcast domain and they absolutely have to introduce layer 3 switching for all devices of any kind? Needing some validation and thinking this through.