I don't know if that's necessarily true, the F-22 is both shorter and lower than an F-15 and its wingspan is only 2 feet wider. It's substantially heavier than an F-15C, but not all that much heavier than the F-15SE Strike Eagle. It also has similar wing-loading and thrust-to-weight ratios.
The F-15 was also designed almost exclusively as an air-to-air platform but has proven to be effective as an air-to-ground platform as well, the Strike Eagle variant being introduced in 1989 some 13 years after the F-15 went into service.
The F-22 went into service in 2005 and production ended a mere 6 years later in 2011. There simply wasn't time to discover the potential versatility of the aircraft. Given its advanced capabilities, I have no doubt that a multitude of applications would and will be found for the Raptor.
I'm not disparaging the F-35 here, though. It's definitely the better choice for the Navy and the Marines, and should be a good replacement for the F-16 in the Air Force. But I think the F-22 should have continued to be produced alongside it.
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