Let me see if I can simplify the Zigbee multi hub question...
Hue uses a different Zigbee profile than what is used by other Zigbee manufacturers. One is ZLL (lighting) and one is ZHA (home automation).
You can pair either/both to Hubitat.
We all recognize the need for repeaters to create a solid mesh. Repeaters repeat Zigbee without regard to the profile.. usually. Bulbs are the #1 exception. They are very poor repeaters in general, and worse for ZHA. This is in part because they are so small and inexpensive. There's really no way to have enough memory for a large Zigbee mesh for the price.
What happens then, is that the bulbs tend to become routers for traffic they route poorly. You can read up about people reporting Zigbee devices falling off the mesh constantly.
The very simplest of answers then is don't use bulbs as routers.!! Simple to say, hard to implement on a SINGLE Zigbee mesh.... you see where this is going now?
People have chosen to keep the horrid bulbs and segregate them to their own Zigbee network.. via another hub of some sort. A very large quantity use the Hue hub as the Bulb/Lighting hub and build out one mesh just for bulbs/lighting. Hubitat, then becomes the Zigbee hub for all other Zigbee devices that are not lighting.
Some don't have a Hue hub handy and when faced with buying another hub, choose another Hubitat. The point is, the segregation, not which hub brand is implementing it.
If all your Zigbee devices are bulbs, then pair them directly to Hubitat and enjoy. If not, and you can create a mesh that shares both, enjoy. For everyone else, when the gnashing of teeth occurs, know that the well worn solution is, another hub for bulbs. Hue or Hubitat or... it's your (budgetary) choice.