From my perspective, F1 is supposed to be “The Pinnacle of Motorsports”. Innovation, as long as it’s safe and doesn’t exclude the less rich competitors, should be encouraged and fostered.

Some of those things (like the fan car) make sense to ban, since they give an unfair advantage to companies with larger R&D budgets and expertise.

Others impact dirty air wash and seem like a good idea to ban to maintain racing safety.

But others, like the F duct and flexi-wing, just seem arbitrary? They seem like positive innovations with no major downsides for any team.