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If my internet was down then no remote access would work. However the controller would still work in the house if my internet is down or if theirs stops working. I have rural/agricultural levels of internet here (4G) which craps out continually but SmartThings still works inside the house. What didn’t work was using lifx with SmartThings as that means SmartThings has to communicate with the lifx server which was not always a goer.
I can’t code and don’t have time/inclination or brains to learn. The ifttt in SmartThings seems to give me the controls I want. Mainly it’s having a button to turn out all the lights my partner leaves on.
As a quick and easy way to control it, it's prob fine, but the issue with these is that they use a web based cloud for remote access, so if their cloud is down, or if your internet is down, it won't work.
If you're willing to figure things out and enjoy a bit of diy, setting home assistant up on a raspberry pi with a zigbee stick is much better as it operates on your local network and doesn't rely on actual Internet access.
I'm happy to help out in getting you set up, and there is a wealth of info online.
The issue with this is that a software update can mess up your configuration.