If the FS1 Series had different trucks and drivers every weekend, applying a points system wouldn't be as effective. Unless there's an even and equal opportunity for drivers to earn points over the set time span of the season, then it wouldn't really be fair or as interesting. Like if you had a bunch of drivers with one or two wins each, how would you really determine a winner? Does that make sense?
I do however, agree with changing up the track design. If you can't change the lineup, change the playing field they're performing on.