But that’s your workflow. I mean, to each his own 
And by that I don’t want to say that there should be tools for everyone’s specific workflow, it’s logical that there is certain intended workflow for every engine otherwise it would become a huge mess of tools. With that said, I think it’s pretty common these days to use at least some form of blocking (via these in-engine geometry tools) and then replacing it with static meshes. Some will use it more, some less, but I think it’s still a valid and useful tool.
Solids in Cryengine are pretty good compromise between good blocking tools and not going too far with modeling in engine when real modeling should be done in external apps. On the other hand, current UE bsp isn’t that far from solids in CE.
Anyway, some further update to solids or some replacement tool would be nice.