Yeah 4 banks is pretty excessive. 2 seems more reasonable.
I have 1 online savings (Barclays) that I'm actively moving away from - no savings account there, just some old CDs. Instead I am using VMMXX in our Vanguard account; similar rates and easy to shift to investments when it gets too big.
Then a B&M in my town for when we need cash/other random in-person things. Technically still have our last B&M account too; I am keeping that one because it is the same bank that owns our mortgage. I split my DD so just enough goes into that account to make the payment every month, is simpler than any other option.