There are ten items on my list:

1 - Dimensioning
2 - Dimensioning
3 - Dimensioning
4...

You get the idea.

You cannot communicate your designs without dimensioning.

Luckily, MOI provides good Sketchup support.

11 - a guide / measurement system more like that found in... you guessed it... Sketchup.

BTW, I don't particularly like modeling or navigation in Sketchup.

12 - Material support (ability to "map" image files to surfaces), also important for the communication thing.