He’ll have less economy than you, with the defenders advantage.
You can scout to counter this, build outposts, walls.
It seems to me high level play needs to have these options in there because it’s just more fun to watch.
The more strategies are available, the more players will attack early and the more variety, suprise there is.
Not that I’m one of these high level players, my rating is ~1400 on HD, so really really bad.
One thing I’d like though, also because I feel it’s more realistic, is to add a non-default option to remove building armor from building foundations:
New players could turn this option on to make defending against these rushes easier.