He did like 6/7 consecutive chapters with action and more serious plot, not to mention the many ones before this arc, this is already much more than Amano did with Reborn in 60 chapters before going full action, so i don't see where he "doesn't want" to go for action arcs, also, the series isn't a "romcom" it just have some romantic elements, it would be very "meh" if Gondaira start to create generic romcom drama between Taiyo and Mutsumi, isn't really the point of the series and it would drag it down.
Very obvious why you don't have a problem with Magazine romcoms, you only read one, they have 4 full romcoms with another one already announced in the future, not to mention other series who relies in romcom/romance stuff like the shogi one and Hitman.
You're mixing gag with series that mix comedy and other genres, Jump was always like this, it will always have mix of comedy with other genres, and gag series, isn't desperation, is just how the magazine works