Some coaches do prefer to put the heavy stuff first which potentiates the nervous system and let's the athletes go faster on the speed work.
the lighter stuff simply feels lighter after yo'uve done heavy work. To test this, work up to a 2-3RM in one of your lifts, rest a few minutes and then take 65%. It'll feel so light that you can really fly with it.
I think I put the speed work afterwards becasue I considered the heavy work more important and didn't want any fatigue going into it for the girls.
just different ways of approaching it. I'd say the most common way of sequencing stuff within a workout is
Or you can take the WSB approach and put max effort and speed work on different days to avoid the whole issue.
That's simply not the only way to do it.
For powerlifting, I consider max strength to be more important than speed, making max strength work relatively more important. For a speed-strength sport or pure speed/power sport, I'd probably reverse it.