While I agree with you, the target market for that brand isn't particularly interested in 0-60 times.Good point on the Volvo/Yamaha V8 though. I forgot about that one.
I've had the pleasure of driving several S80 V8's, and they SCOOT. Horrible to work on, but they really move. The XC90... not so much. Honestly, the V8 should have been the only engine offered in those, with MAYBE the 2.9 T6 as the base engine. Both the 2.5T and the 3.2 are terribly underpowered for something that size. Heck, the 3.2 is a dog even in the standard S80/V70 cars!
Volvo has a history of making under-powered vehicles, dating back to the last century.
This is why the Volvo V8 swap was so common on the old 200 and 700 series.