My gravel bike and pavement bikes are the same bike with the same tires (Soma Fog Cutter running Compass 35s or 38s). I don’t even feel the need for a second set of wheels or tires.
After 15 years of riding 23mm tires because all the “serious” road riders said I should, I built my first “gravel” bike (Salsa Casseroll, a road bike that could run 35s) 7 years ago.
I had planned to build up another pavement bike (I had pulled some parts off the old one to build up the Casseroll) but after a few months on the Cassroll, I knew that my days of running anything less than 32mm were done. Now, after a few years with more and better options coming out in larger tire sizes, even 32mm seems too small to me.
The way I see it, gravel bikes are just road bikes thay don’t suck on gravel. That’s how it works for me anyway.