I don't understand what you mean. Construct doesn't have any direct integration with GitHub. I guess by that you mean the folder based projects? But those are still supported in r225 just as they are in r218. (You just have to be on the latest version of NW.js, and the editor prompts you to update if you're on an older version of NW.js.) There's also been no change at all to Steam support between r218 and r225. So there shouldn't be any material change between these two releases. I don't know what you're doing or seeing that's behind this apparent claim that Construct has removed or changed these features - it should all still be there.
As I said, staying on old versions generally causes more problems than it solves. We fix dozens of bugs and make loads of improvements between stable releases. If you don't update, sooner or later you run in to difficult problems that we already solved. People already routinely file issues and contact support about issues we've already solved, and it turns out they kept using an old version of the software, and updating fixes it. It's certainly not a panacea for all software problems!