I recently got interested in LEGO Technic again. The last set I own is maybe 15 years old, so my knowledge is a little bit outdated.
Back then some of the Technic sets had action figures included, like the (1990) 8830 Rally 6-Wheeler:
And if I remember correctly they used seats for those figures in many Technic sets.
Both, seats and figures, seem to have disappeared from recent sets.
When (and why) did LEGO discontinue making the LEGO Technic action figures?