The only thing I don't like about subscription is rent-seeking. I'm fine paying a small amount every month if I expect security updates or small features that won't impede my workflow. If there is a lot of request for additional features, you can always bump up to a new version. If there aren't, that means your product is mature, or you may need to market to a different segment. But I'm not paying you every month just to shuffle the UI around or to be able to access my data.