Mongol Invasion - really improves Sengoku Jidai campaign?

Hello everybody, I posted a technical question in the apothecary,

https://forums.totalwar.org/vb/showthread.php?t=61115

, but related to this there's a STW related question.

I see I haven't nor /throne nor /evanims videos in my installation: that's because is a minimal install of STW, but before MI you played with CD #2 and you had the throne room...and the /evanim videos (ninja, etc...). If I install Mongol Invasion, I have to play with the MI CD and I haven't those videos. I haven't enough disk space for a huge STW install and a MI install, nor to manually copy videos from cd#2 to the hard disk.

As I say in the above topic, I'm reinstalling the game four years later. I didn't played much the MI improvements, but now I want to play a classical Sengoku Jidai campaign (including those great videos). So, the question is: the improvements made to Sengoku Jidai in MI (Kensai, Battle Ninja, etc...) are enough to reinstall also Mongol Invasion? Or I don't miss much, and should I only install STW with patch 1.12, and only install MI when I want to play the new expansion campaigns?

Thanks

I think most would tell you Just to play the origional shogun if you want to play single player.
But if you want to play online install MI as well.