Personally - I don’t think you have much to worry about. Let me grab a picture (link) of the mushroom of my Pro-700 18 months on from back in the day.
10 months:
18 months:
Of course the steam/service boiler is a different issue as the temperatures in there are higher and will scale up faster.
I don’t have an Osmio so I don’t know if what you see is actually limescale or not, but Dave has been using one for many years now and he never descale his machines as far as I know.