I use everything in Home Assistant. I don’t even own a Hue Bridge. But I own LIFX lights too, and I still use Home Assistant for all my automations because sometimes I mix 'n match.
Mix 'n matching in the same room
For instance, the lights on my PC area are LIFX A21, but I have Philips Hue A21 on my lamps in the same room. Why both? Because the LIFX ones are color and the Hue ones are more reliable over time. Less likely to have issues.
Also, I bulk buy lights, but I get them at different times. I had some failures in those lamps, so I swapped them with whatever I had at the time (Hue).
Mix 'n matching in a fixture
I don’t like mix 'n matching in fixtures, but in my Entryway, one of the IKEA bulbs went bad, and I didn’t have any replacements on hand, so I used a spare LIFX Mini.
Interaction with other devices
Point being, if you do everything in Home Assistant, if gives you more power. You can also hook into other devices too like turning off or dimming lights when watching something, but bringing them back up when paused.
Took me a while to get outta the LIFX system for scenes and schedules, but it was well worth it when I did.
I have half my lights as Zigbee and half Wi-Fi now. The colors match up so well you can’t tell. I like that I can buy from any manufacturer based on price, availability, and reliability (I only bought those color 800 lumen IKEA lights because they were $10 each).
Magic “always what you want” state
Last piece: Home Assistant does some magic when turning on or off lights. If it doesn’t work the first time, it keeps trying for a while until it happens. LIFX lights will sometimes get stuck, so unless you ask them a few times, they might not respond. I don’t know what the timeout is, but I think it’s around 5-10 seconds, and I don’t have issues with lights staying on or off anymore.