There’s no need to preplan a deload. Deloads CAN BE great if you’ve been going hard 6-10 weeks. Maybe you tried progressing in load, intensity, or volume and your body is starting to break down. A few days isn’t going to cut it, so a week or two of purposefully cutting the intensity and volume is pretty great.
You should know your body well though, and be pushing very hard for an extended period of time. Otherwise, fatigue and recovery management can keep things going for a while.
You can’t always bang out exercises with high systemic fatigue. You can’t always train balls to the wall. If you feather in days where you use exercises with less systemic fatigue, you’re going to extend your growth periods for much longer.
Also, grinder reps and breathing out your sets (8 squats… breathe a few times… 4 squats… breathe… 3 squats… breath a few times) will totally fuck your fatigue/recovery if your doing it all the time.
Tough guys who want to be morally superior will disagree, but mostly out of emotional attachment and stubbornness.