It depends what stability you want and how you define it.

Bitcoin has kind of stable monetary policy, i.e. the rules haven't changed since beginning. It is also somewhat unstable from other PoV, i.e. the emissions halves every ~4Y.

And we can look at absolute price stability. Those prices aren't much stable in Bitcoin. I hope they will be once enough adoption is done, but we aren't there yet.

Or we can look at relative prices stability. Since every progress makes something cheaper, any progress inherently changes relative prices, which is good for efficiency. Making prices stable goes against the efficiency gain