I don’t see a point of using a smart switch with smart bulb. Mostly because every time you turn off the switch the bulb will turn useless because it will be powerless and the next time you will turn on the switch, the bulbs will need to reconnect to the network (and in some cases need to reconnect to the bridge too.
In this case I believe that more smart devices do not add but decreases the features instead.
Smart Switch PROs:
Control multiple bulbs (preferably not smart) – you can group multiple Smart bulbs too
May be able to dim (if the bulb is dimmable) – Smart bulb: Dimm and change color temperature too (waiting for the Full Color Smart Bulb from wyze )
Schedule the function of the bulbs – can be done with the smart bulb too
Probably need the neutral wire in your switch as the switch needs to be powered all the time to be functional and many houses just run the black wire for the switch and bulbs (there are some expensive smart switches that workaround this tho) – for the Smart Bulb you just need to keep the switch on
Conclusion: IMO the only factor that would drive the use of the smart switch is if you have a room with multiple bulbs that you want to control with one cost effective device (assuming the cost of the switch is lower that the bulbs)
I’m not considering the impact on the wifi network as we are including more and more devices anyway.