If they’re not repeaters, nodes going on and off is no problem. That’s what mesh was designed for.
If they’re repeaters, yes, it can be a problem. But smart bulbs can and should be left on power all the time. ( see manufacturer instructions.) There are many options to use for smart switches that will give you a tactile physical wall switch without cutting power to the bulb.
In the UK, Popp and devolo make a very nice battery operated wall switch to use with smart bulbs and community members have devised some mounts for them that will meet most peoples aesthetic requirements. In the US, there are two available “smart switch covers” that fit over the existing wall switch and solve the power issue. There are other options as well.
The issue for this thread is something altogether different-- The fact that smart bulbs attached directly to the SmartThings hub do not appear to repeat correctly for other ZHA devices. That’s true even when they’re always left on power. 