I would take it from your post that you are not a software developer.
The truth that is missing from their explanations is mirrored in your attitudes and expectations.
They were going to go with longer times between updates. Several months. However, Uprising 1.0 was ... junk. It broke the game and reduced expectations for many. Some patches made slight improvements. They hunkered down and tried to solve the problems then released 1.1. Which was worse. How that happened is a mystery to myself, maybe even to them.
Fast forward to now. They have the CPM in place because they had ignored their fans for months. Now they are more responsive and CPM adds to the communication as well. However. There are hundreds (if not thousands) of problems. They have a small team. Very small when compared to many game studios.
Game breaking bug fixes have highest priority.
Art assets work continues and are included when finished (hopefully tested).
Additional game elements are added (the hated Flaylock pistol for example).
Some tweaks require little to no software changes (just database values).
Many features requested by the DUSTERS are read and some are added to the list to consider in the future.
Bugs are tracked and high level bugs; Which might not be game breaking, only disrupting the gamers (like chat problems).
Meanwhile 1.4 is already done and was in testing. The term used by the industry is Polish. That is pure game industry BS as that is known in actual software development as bug fixing.
Back in 1.3 they prioritized the remaining efforts for the next several releases. The vehicle mods were extensive. Probably too extensive to include in 1.4 as it already had effort that MUST be delivered. So all the vehicle efforts were pushed to 1.5 with the exception of the stupid removal of the Free LAV to fix the wrong problem with Murder Taxis*.
Now 1.4 is being released soon and it will incorporate corporate taxes with some much needed UI updates. Many of these fixes are
Gamer Facing Changes. That needs to happen such that the gamers see change, good or bad. As the vehicle balancing and whatever else needed too much work to get into 1.4 it became the focus for 1.5. Which is nearing completion as I type this.
So that is a from the hip of a retired software developer on why the sooner than later fixes
simply cannot happen. All the vehicle balance needed to done
at the same time. Putting those fixes out piecemeal will only cause more problems earlier and are disruptive to DUST and the developers.
Hope this helps or was, at the very least, amusing.
* Hey, I never said they were good at this. See my posts regarding Small Missile Turrets.