Deflation is a very bad thing...

Of course it is. Things getting cheaper is really bad for the economy.

That's why computers never became an industry, they just kept getting cheaper every year so nobody bought them. If only computing power had kept getting more expensive every year, we might have some kind of tech industry!

A single (luxury) sector getting cheaper is not the same thing as generalized deflation

Computers are not a luxury sector, they're practically built into every device because they're so cheap.

They're also hardly a single sector. What does growth look like if you remove tech stocks?