The bayonet rendered the Pike obsolete, infantry did not take as long to reload their firelocks. Cavalry had for some time been used to flank enemy lines, or destroy wavering units. Hunting down retreatig or fleeing units was also their part. But a charge of cuirassiers could still endanger an unprepared front line.
Pikes were the reserve of poorly armed revolts usually in this period.
But the early French Republican Armies, which were of an increased size, used them too.