Syncro shifting, bad?

[GTO]

Last night I was testing out how to downshift smoothly and found (for instance) if I'm cruising at 70KPH in 4th, I leave the accelerator pedal where it is, engage the clutch and smoothly put it into three and release the clutch in one smooth moment I can get completely unnoticeable gear change into 3rd gear.

I’m sure its called “syncro shifting”.

Basically I want to know, if syncro shifting damages a standard WRX gear box?

Spoke to some people and I get conflicting answers, my view is that; that it’s a modern syncro tranny, since there no sudden change of load, no noise, resulting in an unnoticeable shift it should be ok?

Comments please!!!