Which is a very reasonable complaint, considering they have outright refused to expand their team, and the current speed is therefore unlikely to increase.
This is an honest question, what example game would you give that you feel meets the expected speed of updates?
I don't think you'll find that our team is much smaller than what might be expected. We're about say, half the size of some normal indie studio, but unlike them we have no other projects in the pipeline. Usually, if you had a team of 20, you might leave a skeleton crew behind to work on updates, while the rest begins work on the followup title, which might release anywhere 3-4 years from now.