The issue is not too many strikes but too many pitches down the pipe. Sometimes it is better to throw a ball than a fat pitch.
That especially applies if you have mediocre stuff. If you have huge stuff you can get away with more. I listened to a podcast where they said the rays told glasnow to basically aim down the middle (just worry up or down but aim middle of zone) and let the movement take care of the rest and it worked for him because he has huge stuff. but if you watch for example Zack greinke who doesn't have great stuff anymore he will nibble around the edges all the time which works because he has great command of course- guys that throw many "uncompetitive pitches" (like glasnow before he joined the rays) can't afford to do that because they fall behind more often.
Ideal of course would be to not throw too much in the zone but still get many strikes by chases. But for that to work you need to throw competitive pitches.
I'm not a fan of the good old "waste pitch" or "changing the eye level". If you are ahead you don't have to throw in the zone but don't throw a shoulder high fastball or a 55 foot curve that rarely gets swung at by advanced hitters but throw pitches just off the plate that are "too close to take"
I can understand coaches teaching the 0 2 waste pitch to youth hitters because they hate seeing 2 strike hits on a ball down the middle and also young hitters sometimes swing at a pitch "over their head" but more often than not the waste pitch leads to 0 2 turning into full counts and even if not it drives up the pitch count.
So try to throw competitive balls that are borderline strikes or slightly outside and not throw the straight shoulder high waste pitch.