Sorry, I’m confused about this.
Are you in the US or another country?
If you are in the US, there are many different networked light switches that you can use with SmartThings. Like most electronics, there is a fairly common evolution with some models being discontinued in other new models being introduced pretty much all the time.
I wonder if perhaps you are referring to the Leviton switches that had two buttons in a single gang format? That particular model is discontinued last year and there really isn’t anything similar on the market. But the current alternative is to instead using in wall micro that can handle two buttons and connect it to a nonnetworked switch to give the same end result.
Those devices will still work for the circuit branch to which they are connected even if the Internet is down.
Another alternative is the Lutron Caseta system with their pico auxiliaries. Those will work locally even if the SmartThings hub is not working.
The only things that stop working altogether without access to the SmartThings cloud are some of the “button controllers” which have multiple buttons but which do require the SmartThings in order to process the messages.
If you could be a little more specific about exactly what the use case is that you are concerned about, perhaps starting that in a new thread under projects, then maybe we can help figure out if there’s a device that would work for you.