Yes, I have. Hell, I pre-ordered it cause I’ve been waiting for it to be added for 6 years now.
A lot of the reasoning behind it having worse things than some TT vehicles is oftentimes on Gaijin (such as deciding to mishmash the US F-5E even further by giving it the most modern RWR it had). Theoretically, Gaijin could give the F-20A the ALR-67, since Paul Metz’s book did state it (however bug reporting that isn’t likely to work due to lack of primary sources).
As for the drop tanks, that’s a Gaijin thing. Oftentimes, they’ll add drop tanks when they’re ready/available, so I imagine it’ll happen sometime by next update or the update after (and the F-5Es are likely to get the same tanks), as I imagine they haven’t been modelled yet (or else they would’ve been datamined).
As for the Countermeasures: This is probably gonna be the most disappointing part for you, but the F-20 would’ve used the exact same dispenser as the F-5E, which could only hold 30 flares and I believe up to 45-ish Chaff (will need to double-check sources on chaff again). Gaijin has actually gone a bit ahistorical with the flare count here, as historically the ALE-40 could only hold 30 flares.
The only way for this to get more CMs would be implementation of the ALE-37 CM pod (same one as found on the AV-8A and A-6E TRAM), which was supposedly compatible with just about any NATO-standard pylon. However, resources are limited, and it’s not likely you’ll be able to find any evidence the F-20 could support such a system.
Finally, missile load: Once again, we’re getting a better set up (with the 9Ls) than the F-20 likely would’ve gotten IRL, though there were a few issues on the dev server (such as lack of AIM-9Js as “stock”, and no ability to carry a single sidewinder on each underwing hardpoint rather than 2x on the dual-rail system).
I believe a lot of folks here kind of fell into the expectation that the F-20 would be comparable to the F-16 in all regards. While it is in a few, this thing was always meant to just be a medium-sized step up from the F-5E, for those who couldn’t afford or were barred from purchasing the F-16. It is worse by Northrop’s design, not Gaijin’s.