Not necessarily. You're going to need device drivers. The generic may work and then again, they may not work at all and you'll need a specific driver for your devices, if they even work at all. Xiaomi are inexpensive and those IKEA plugs work as repeaters which seems to keep them stable. I've had no more issues with Xiaomi since adding two of those outlets to my 1200 sq ft home.
You're best to move away from the WiFi devices and cloud based control, but if you want to linger with what you have for a while, you can control cloud based devices with Google Assistant Relay. It's another computer or Raspberry Pi required and a bit of setup, but you sound like the type that likes to tinker. So if any of your WiFi devices are also supported by Google Home, then that's your answer. What you do with it is create rules with Hubitat Rule Engine then sends text to speech messages to the device. So for example, if you wanted to turn off "Man Cave Lamp", you would create a rule that when true, send the phrase "[CC] hey google, turn ON man cave lamp" and it would be done silently, as if it were directly integrated with Hubitat. The [CC] before the TTS phrase sends the command without response from Google Assistant. To turn the light off, you would set the rule to send the phrase "[CC] hey google, turn OFF man cave lamp".
I do this for some devices that don't have an integration with Hubitat, but do have a Google Home integration. It works well and is fast enough for the need. However, you're still cloud based of course, and this is a community driver. Not supported by Hubitat,
