Have to disagree with this. While as a strategy it has disadvantages (such as much decreased ability to project power i.e. putting your planes on air superiority mission over a sea zone), the CAS-fighters can get ridiculous trades which is all that really matters most of the time. Also, at some point since BBA released (this was not true at first), a change was made that allows bombers to engage other bombers, and this seems to take
priority, so CAS fighters will absolutely delete an enemy's CAS that are up in the air. Previously, a theoretical counterplay to CAS fighters was to just not dogfight them and only put up your own dedicated CAS, which would do more actual damage to enemy troops. Now, your slow bombers are being engaged by basically a fighter plane that has extreme doctrine buffs and will take losses in ratios like 1:100.
I don't want to clog up the thread with excessive details from teh testing I did, but suffice to say this was the result of 8k German CAS fighters vs. 8k French fighters 1k french CAS. 1940 techs with full doctrine (BS vs. OI) and relevant spirits (the CAS mission one vs. centralized control). The French even have better base detection and efficiency since we are fighting over Northern France.
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CAS fighters outtrade dedicated enemy fighters (that are also objectively better since they have self-sealing fueltanks since allies can afford rubber)
and shot down the entire starting deployed french CAS force in 1 month.
Also, a minor benefit of CAS fighters is if there is no combat going on, they just don't fly, so you don't waste fuel or planes dogfighting when there is no combat (and thus you don't need air superiority or ground support bonuses anyway). This isn't a huge deal, but probably nice for Germany/Axis especially (or in SP as anyone fuel and/or IC-strapped).