It's EcoBoost car from this year with a new nose and rear wing, that's all. I can see why they've done it. Even though wingless cars with threaded tyres probably teaches the kids the most, they don't want to do it when FRenault, F4 etc have wings and slicks. And it is all about bums on seats.
The main problem is that everyone is too professional these days. You seem to have to have a big truck, fancy garage floors, a dedicated datalogger analyst, team radios, pitbikes etc, so the cost of the car is actually a small proportion of the annual budget. Obviously you can't force teams to run a car out of a trailer, with one mechanic, home rebuilt engines, no datalogging etc.
The way to lower budgets and boost grids is to get rid of all this stuff, slash the costs, and return to simple racing.
I'm a victim myself - we have a truck and an awning, and a small pitcrew, and lifters, and dataloggers - so I'm not totally innocent. But I refuse to have garage flooring or team radios or a prat perch!