The main problem is a question of expectations and type of platform.
SL is great as regards the building and honestly even superior to DU as regards the detail that can be included.
But SL is not an MMO in the strict sense. It is much more of a metaverse.
In SL you can build as much as you want and how you want (within the technical limits of the SIM) without being tied to any economic system. DU is not like that: everything you do is contextualized and inserted into the socio-economic ecosystem.
In SL the terraforming tools are always available to everyone. In DU everything is regulated by talents that must be progressively unlocked over time.
In SL you are whoever you want and at any time you can be something else. As long as you have a sim, you are practically God. In DU ... well ... no. And you can't be because otherwise everyone should be and ... well ... it wouldn't be DU anymore. It would be SL.
But you can join the big orgs and tell them that you are a builder, that you will only do that and be honest with what you want. I know at least a couple of very strong orgs that let their members do what they really want, and they have some great builders.
If you want to be a lone player and do it all by yourself well ... I am and it's tough. I can't do everything I want. I fit. But there are other better organized loners who do great things.
I think you simply have an erroneous expectation about DU, it is not DU that is incomplete (not just at least ...)