In the latest Q&A Caspian said instead of picking between an Ursaphant and a Trison that those backers would get either a Tier 1 or 2 token. When the time comes the backer may trade the token for a mount that falls under that classification and it can be native to a biome different that your starting one. As for the wagons those are universally useful except for some biomes (swamp, etc.).
The tribe write ups give a fairly good idea what kind of architecture each tribe primarily uses, including differences between social classes. The buildings one will buy with their EP will mostly likely be those of the native tribe as they would use the most correct building materials/structure for the environment. SBS may allow for buildings of different tribal styles to be purchased but will probably need more frequent maintenance without the needed resources to do so possibly.
As for your last point, that is rather far from the truth. The devs have show they have given a great deal of thought to their plans and decisions. They even have even adjusted their plans based community's thoughts/discussions if they thought good points were brought up. I understand not everyone has the time or wants to spend much time doing research on the frequent updates SBS has been releasing. I can understand that but the consistent unconstructive criticism and nay saying is becoming tiresome especially if one hasn't put any research to back their claims.