For the Hue Festivia lights, does HA offer as many nice patterns/animations as the Hue hub and Hue app? I’d rather not use their hub but perhaps I need to in order to get the best out of the Hue fairy lights?
They should be zigbee based like other hue lights so you can skip the hub, I would connect them to the HA setup and see what options they get but with my bulbs and led strip I only have colorloop or off for effects (though I don’t really use them personally I just tie it to a circadian integration).
That said you should be able to get around that by using the automations to make custom effects.