I can help with a couple points, and I'm sure Rainier will help with the rest when he checks in here.
Yes, all your eggs are in one basket. Backups are always a good idea and certainly your choice.
Route creations will be better soon.
HITS does work with altitude (but not in demo mode, if I remember correctly). This is how it displays GLS & GPS approaches, in addition to the HSI.
Rainier will have to comment on the obstacles and declutter.
These products are very new, and he is constantly adding features and upgrades to make them top of the line.