We have the "plain" bomb because that is the vast majority of what was used in WWII. If you want different types of ord, you'll have to fly in a different era. I recommend Janes F-15. GBU's, CBU's, runway busting Durandals, Mavericks and HARMs. And oh yes, they still have the "dumb bomb", very similiar to how it was produced in the 1940's.
So, it's more historical realism than HTC holding back new laser bombs from us.