Can be different reasons to not use fiber blades:
-no have enough skills
-no good fit
-no good footwork
-no mastered low dwell time
-disabled like me
Other reasons:
-blade weight matters a lot (flex, sweep spot, etc)
-rubber matter a lot (weight, grip, hardness, etc)
-so combo blade rubber matter
-all wood flex blade with tacky or stick rubber increase dwell time so can get the speed like Chinese rubbers with low arc that you get the speed through the topspin
If your target is feeling, control and not play far from the table all wood blades have market & sense.
If your target is power, and play far from the table better to use fiber blades.
No magic, no meaningless, is all logical if you know what's your target & how to use the blades and rubbers.