U make something wrong.
How the fuck has he the time to build up Vet 5?
And.....Is it possible that u forget units? You can only focus on 1 point of the map?
It's pretty simple: game drags on for more than 25 minutes, mainly because:
a. it's rare to hold all 3 VPs since the start and for 15 minutes.
b. they focus on one side of the map (2v2, remember), cling onto 1 VP while stalling another one.
c. shrek lets blobs build up veterancy on anything that isn't infantry at an unnerving pace, it's roughly 3 shrek shots -> 1 vet or something, bounce or not.
d. against, map design dota-style which end in a meatgrinder, where eventually they take the upper hand by attrition.
More than forgetting units and leaving them to die / idling it ends up with a lack of stopping power against an increasing wiping potential.