Every set to failure?

I’ve been doing every set to failure (usually 6-8 reps depending on exercise. 1min 30 rest between (I read this is best for women)

The reason I’m asking is I seem to be able to do one less rep every set. Like my splits for dumbbell bench press this morning looked like this. My goal was 4 sets.

1 x 8 @ 35lb

1 x 7

1x 6

1 x5