How many shrinked ogres are there? Few from toys? Maybe some low lvl quests, that still use old models from vanilla.
For 99,9% of the game we see big ogres, that's the appeal, they're big, look dangerous, smash, smash.
Shrinked ogre look and move like a virgin on brazzers party.
The same goes for Vrykuls, you shrink them, they look weird.
Blizzard would have to remodel world around them.
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Linkedblade, size is the issue when it comes to gameplay.
From the lore pov like 80% in the game would be different, that doesn't really matter.