Thats true for the 1st serve.
I agree with
@S&V-not_dead_yet that for 2nd serve it doesn't work, you want max RHS and max SPIN, because u hit way above net and make it dip down.
But on the 1st serve it can work very well, if you hit 100% out you don't have much precision, but if you serve at like 80% you still get alot of rhs but you have much better placement and precision.
I just played a match today against a guy who is a bit worse player than me, but hes decent, but I know that my serve is extremely fast for the level of players im playing and that I don't need to hit it extremely hard to cause alot of problems and also then get only 20-40% of them in, so I rather choose to serve at like 70-80% RHS and also added alot of various spins, from topspin, to topspinslices, to bit towards kick, so the bounce was extremely unpredictable, and my placement and precision was much better with 70-80% RHS so I could really aim in the corners well and consistently.
And I got like 70% 1st serves in for sure, and it caused him huge problems and he made tons of unforced errors from them, never got even close to breaking my serve.
Of course if I was up against someone who could tee off these serves I would be forced to go for more, but sometimes you don't have to.