I don't agree with changing something just for the sake of change.
Which of these seems like the better option:
[1] Getting VERY GOOD at a limited lift selection (keeping lift selection steady)
[2] Getting AVERAGE/DECENT at a larger number of lifts (always changing)
IME option 1 will usually prove to be ideal in most cases.
Also, consider what happens when you switch movements and drop them for other lifts - you aren't training the old lifts anymore, which means those qualities you built up are going untrained and it won't be long before you regress in the improvements you made on those movements. It's always better to do a maintenance amount of work for something rather than let it go untrained for a period of time if it's something important, this applies to so many other aspects of lifting too.
I've been using pretty close to the same exercise selection from when I started lifting and if I was always changing movements I wouldn't be nearly as good at those lifts. I think size gains would suffer as a result of this all else being equal.
Too many lifters make the mistake of assuming it is necessary once things slow down to change everything: no, you're getting better at something. Once you're already good at something it stands to reason that it's going to take more work and more time to make further improvements. Patience is important here.