"Smartswitches" is often used to refer to both actual switches and the more common dimmers. SmartBulbs can be used, with some limitations, with smart switches, but cannot be used with smart dimmers (the PWM dimming control wreaks havoc with the microcomputer/microprocessor power supply inside all smart bulbs).
I would suggest that you elaborate further on the type of communications used by smartswitches/smart dimmers. Consumers may think Wi-Fi is the only choice, while savvy smarthome buyers know that Philips Hue uses Zigbee and other more hobbyist friendly brands use Z-Wave.
There are pros and cons to all of these wireless protocols, but don't overlook the vendor specific (aka "proprietary") alternatives. The most popular include Insteon (dual mode - both line carrier and RF) and Lutron (433Mhz RF).
I've tried them all and for both technical and business reasons have found Lutron to be far superior. Lutron is rock-solid, does not have the unreliability of Wi-Fi, and the lower frequency band used provides much greater range and reach than other wireless methods. Lutron has chosen to play with everyone and is certified for Apple HomeKit, Google Home, Amazon Alexa and has an API that has been incorporated into most hobbyist/DIY systems including Home Assistant, Hubitat, Smartings, and others.