The Misano MotoGP test may well turn out to be more important than it might seem at first glance. Perhaps precisely because it was a private test, and the teams could work in some privacy away from the prying eyes of most media. The pit lane was closed, and there were virtually no media present, with the honorable exception of Italian stalwarts GPOne.com.
It meant that factories could test early versions of their 2020 bikes with relatively little interference from outside, other than the usual crowd of engineers from rival factories gathered round as they warm up their bikes. And that is precisely what Yamaha, Honda, and KTM in particular spent their time doing, while Ducati and Suzuki debuted a few parts which may or may not see use next season.
It wasn't only the motorcycle manufactures. Michelin also brought two updates, a rear tire with a different casing to help improve performance, which was also tested at Barcelona and Brno, and a new front tire with a stronger casing, to help give support in braking. Both tires received positive feedback, the riders praising the front in particular.