Tough one.
For me it depends on what the purpose of the Kit is, if I want to display a Tank in a Dio I wouldn't worry that much about indi tracks, interior, etc.
If I want to show of just the Tank than I want LOTS of detail and if there is plenty interior stuff I might do a cut-away model to show it of.
Example of too much and not enough:
DML King Tiger with Porsche Turret, nice gun breech, nice detailed hatches. Now where is the rest of the interior and the crew??
That for me is a half-hearted effort, if I put it into a Dio you most likely won't see the gun-breech, for a detailed view there is too little as anybody can plainly see that there is NO interior detail besides the gun breech.
The same can be said for any other genre or kit group out there, to me it seems that companies now make their kits with AM parts & Accessory kits in mind already.
Kit I like is the Tamia equivalent of the above:
Builds nice out of the Box and can be used as is in a Dio, OTOH, they also offer indi-tracks, crew at reast, engine and maintence crew, etc so that it can be expanded into a more detailed kit for display.
These days it seems that there is an agreement between kit makers and AM makers, lots of new Kits like Turmpeteer, Dragon seem to scream at you already "You need AM parts to make me look nice".
Yip, the Kit is cheap add in all the AM parts that you buy for it and is it really cheaper than the higher priced offering and often more detailed offering.
Anyhuh time to jump of the Soapbox and let someone else rant & rave.