Not at all. "Experimental" is the branch/release version. In steam it's in the Betas tab, you would need to opt into it. For long timers like me I've been doing experimental releases with Satisfactory for years, and it's part of a way to give back, give bug reports and note things that are weird. For you, doing nothing will keep you on the stable branch :)

I'll add that stable is usually that, very stable, but even on big stable releases, back up your saves just in case. They've always been good of it staying on experimental until they're very sure it's stable, but better safe than sorry.