Why we must pay for updates if there is no updates anymore?
Because the people at Spacial can't live from love and air alone?
Honestly, though: I think they did a great job improving the software in the important areas over the past 1 or 2 years, whereas they mostly added the cloud features and other stuff that's useless to me in the years between switching to subscription model and 2017.
Only 2 till now for this year.
The last one is 2019.3 and also nothing special.
The first update with the new FileManager was a major new feature that most likely required lots of testing and work to get done.
If who they list on the team page is really their whole team, they merely have 4 developers maintaining 2 different products/ecosystems with barely anything in common. (SAM BC - Desktop, Delphi vs. SAM Cloud - Web, ASP.Net/JS)
Shipping 2 new releases of the Desktop software in 6 months is quite the challenge with that little personnel.