Why do SLR cameras need brackets? No anti-shake lens? Aren't parentheses redundant?

Anti-shake lens or anti-shake body can only reduce camera shake when shooting, but it can't be completely avoided.

Only the bracket can completely avoid jitter.

So professional photographers use tripods to shoot.

It should be noted that when shooting with a tripod, the anti-shake function of the lens or fuselage must be turned off.