I think people is concerned with price deflation and not with monetary deflation. As you say, bitcoin doesn't have monetary deflation*.
To have price deflation with a stable monetary base, you assume you're going to have economic growth. If a price deflation caused only by growth is good or bad for the economy is to be proven in my opinion. But "deflation is good because everything becomes cheaper" is not an statement that I can agree with.
By definition, if the economy is actually growing, then the price deflation must logically be a reflection of good tidings.
I can't really believe that this has to be stated.
A reflection, yes. Growth causes (with a fixed monetary base) deflation, that we agree. But what is to be proven is that it causes a further economic development or if it can cause (without a previous inflationary boom, just caused by real economic growth) a recession.
Many people assume that if the price deflation is caused just by growth, it is harmless.
If the price deflation is a product of economic growth, than it's logically impossible for there to be a recession caused by the same.
Um, no. Review your logic.