I'm a little biased, but I'll second the recommendation for CoCoHue. 
However, as-is, it only lets you use scenes you've already defined in Hue (or a third-party app). It does not let you create scenes on Hue from Hubitat for use with other Hue-based apps/automations as some third-party Hue apps do (I don't see a good use for that right now from Hubitat, but it's an idea I'll play around with when I have time). You can still use Hue bulbs or groups in Hubitat scenes.
That being said, part of what you described doesn't sound like Hue scenes at all: the "candle light flicker" thing sounds like something out of Hue Labs, which often uses a combination of scenes (poorly named so hard for a third-party to tell what they are--and ones that are invisible to you as a user of the Hue app) and "schedules" (not supported by CoCoHue or any Hubitat Hue Bridge integration I'm aware of), and possibly more undocumented features, to pull off some effect. These are usually things Philips plays around with and may or may not eventually release as supported features that would be easier for third parties to access.
Hubitat is far more powerful that what you can do with Hue's rudimentary automations alone, and it allows you to use the same sensors for other purposes besides lighting. If all you want is app control, voice control, basic timers, and whatever limited motion and similar automations Hue lets you configure, then it's a good enough system on its own (though I originally started with SmartThings because Hue offered almost none of that at the beginning and I wanted something to automate them--nobody really wants to use their phone to turn on the lights).
