Jolla's way is to release often to bring improvements more rapidly. It also allows rapid feedback on how the platform is evolving, instead of taking something like 8 to 10 months preparing big update that "makes it work before making it work better" and then findinf that changes were not welcome after all. There are always caveats on different update models, but honestly I prefer current, more rapid incremental updates compared to waiting for next PR with N900 or N9.