Yeah, i understand if some people feel bored with frequent curb-stomp. For many times Empire seems always caught underfoot and unprepared by JSDF which lead to inevitable curb-stomp. Personally if not for good art and scene presentation, it'd be boring.
The harem hijinks can be as worse, especially Itami act like usual harem protag lately.
At very least for each curb-stomp, there are some consequences for Japanese govt, even if it just from politic and diplomatic side. It's interesting to see the diplomacy and politic struggle that ensues.
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ZdrytchX
IRL yes, JSDF still operate a lot of cold war materiel. Replacing all of them with newer materiel is costly. As 2017 both Type 74 and F-4 phantom is still in service. Though i read in Phantom case, its also due to delays in F-35 project.