it tends to be true. we do things at the application tier to minimize these things.

for example, assume you have to write A, B, C ... in syscalls it would be

write( A ), flush() write( B ), flush() write( C ), flush()

so if you add a debounce of say 4ms you get

Write( A ), Write( B ), Write( C ), Flush()

and saved 2 flush()-es

This is common with protocol aware storage applications.