Community Manager for Focus Home Interactive.
Some features are more easily implemented than others, and have been worked on for a while. The focus isn't on little things, it's just that different people work on different things, and some are done more quickly.than others.
We are currently working on content updates for Spintires: MudRunner, addressing some of the issues that you have raised here, as well as introducing workshop map support.
First off, thanks for your question!
I've personally played a lot of Escape from Tarkov, and I think it's best said that Sandstorm is a very different game than EFT. You mentioned that you played a lot of Insurgency already, and Insurgency: Sandstorm is very similar to the original Insurgency, with a focus on player-vs-player firefights and realistic shooting. Not so much persistance or focus on looting like in Escape from Tarkov.
Let me know if you have any further questions