"Here's a question does the partial solid reduce ventilation dramatically?"
The goal of the solid is to reduce air flow through the inner and from all accounts it does its job (I have only the noseeum inner so I can't say whether difference is "dramatic").
Just want to clarify, though, that using partial solid inner to reduce draftiness should not affect moisture condensation on the outer "fly", since air flow coming inside the outer is little affected. If anything, there may be less condensation on outer since some airflow that would have gone through the noseeum inner is routed along inside surface of the outer. (Even if condensation on outer occurs it's not a problem because you're in the inner.)
Regardless of which inner you have, if you're pitching in high wind you would pitch the tent lower than usual so its edges come closer to the ground, reducing the total amount of wind that flows through. If no wind at all then pitch it higher so you encourage more airflow through tent.
There is not any problem with the full mesh inner, though, and it is sold as it should be as the standard inner for the tent. Main reasons for wanting partial solid inner would be if you're camping in desert where sand would be an issue or if you're in genuinely cold (e.g., winter) weather.
I don't use a groundsheet and have no problem. Just use common sense and prepare your tent site and avoid areas with especially sharp rocks. Henry Shires, owner of Tarptent, sells Tyvek groundsheets but you can read on FAQ at his site that he doesn't recommend them and rarely if ever has a tent come back for floor repair.