I have been collecting Hue bulbs for years now and have 40+ throughout the home. I keep mine on the Hue bridge for several of the reasons listed above and connect it to Hubitat with the CoCoHue integration. With that I still have access to Hue Groups, Scenes, and even Labs stuff through Hubitat and it's all local. Separate from Hubitat, I also enjoy the Hue Sync feature which allows me to synchronize my lights to music and/or video playing on my HTPC.
As for my Hue motion sensors and buttons, I've moved those over to Hubitat so I can use them to control both Hue and non-Hue devices and to have the ability to do more complex automations.
For buttons, my favorite are the SmartThings buttons. Aeotec has taken over manufacturing them now and they have had price bump as well, but I think they are worth it. I don't have any experience with Ikea's.
