Two big shifts occurred that seem to have significantly changed how the Kroenkes operate. First, four years ago they bought out Usmanov and other outstanding shares, then took the club fully private. This allows them to do things with the club financially that were more cumbersome and required much more transparency/public disclosure under the previous ownership model. There is also much more reason to invest in the club to raise its value now that they own all the shares (previously it was kind of counter-productive to invest money into the club to raise its value, as this would just raise the price of the shares held by others, which the Kroenkes were intent on buying). Second, around the same time Arteta arrived, Josh Kroenke became the de facto ownership figure. Stan Kroenke couldn't give a feck about Arsenal and was exactly as disinterested and unambitious as you say. Josh Kroenke is at the very least a lot more interested and involved. He is sort of an oligarch failson but seems to genuinely care about the club's success, has been quite involved in a way that his dad never was previously, and has convinced his father to cough up a fair amount of cash over the last few years.
I still have my gripes with them but they're not the Glazers.