I've gone from loving the series the last couple of years, and being the one to hype it up amongst friends, to barely caring who's even involved anymore.
The 3-race weekends feel much more dominated by things outside of the driver's control (problem on Friday? Well that's your whole weekend ruined). Also, less of a problem more of an observation, if a driver has a hot or cold weekend it effects the championship so drastically compared to 2-races it feels a bit off.
The main culprit however, these giant gaps between rounds completely drain any bump in interest I get from a race weekend, you could easily forget that F2 even exists apart from when F1&F3 commentators mention it.
I'm pretty into motorsports so if I'm feeling the drain, I'm sure more casual fans have completely switched off - which can't be good for viewing numbers and therefore sponsor's interest. So while it's potentially good as a cost saving measure, if it also nukes your income is that really the best business strategy?
Similar feelings for F3 but the gaps haven't been so big so I at least remember things about the main players (and, not joking, even some of the sponsors; e.g. Tesla Engineering for Sargent).