Why would you expect me to pay 9€/month for Garmin Connect + ?

I guess that was the whole purpose of making Garmin Connect mobile app unusable with the new interface, so that you pay to have the same stats the way you wanted them. If anything, Garmin has proven unreliable, not listening to customers, breaking things unnecessarily. These are not incentives to pay them more. A subscription would make sense if it subsidizes the watch prices, but I can't imagine anyone in their right minds paying $1,000 on a fitness device and then a subscription, however small, to use said device. Soon, they will start removing features from the free tier to force people into the Connect+, but that will only alienate their customer base. And pretty soon, they will announce that fitness devices are no longer a priority and focus on the corporate market. After all, younger buyers are more inclined to buy an Apple Watch, a Pixel, or a Samsung watch. Garmin catered to the professional and enthusiast fitness crowd, and it's increasingly drifting away from them.