Adding to the above...
Most of the things that wear out during normal use do so as a result of the number of engine revolutions. The wear rate of reciprocating parts such as pistons/rings and valves as well as their related fixed parts (cylinders and valve guides & seals) is largely dependant on the number engine revolutions if the car is properly tuned in terms of A/F ratio and properly maintained. I say “largely” because more HP means burning more fuel, and even though you might not see it in the water temp I suspect that anything in the combustion chamber is subjected to some additional heat, which likely increases wear rate to at least some degree. But then there is the reality that you are unlikely to match the precision of the stock fuel system. Running a bit too lean means more heat, and a bit to rich means more undesirable byproducts of combustion that add to wear of those parts.
I don't see the camshafts, rockers, springs as being an issue at all. Engine bearings are the other primary wear items and although they too are mostly dependent on the number of revolutions, the added load of creating more power per stroke must increase wear. Perhaps more so the rod bearings than the mains, but I wouldn't know how to estimate the degree on either one. Another possible factor in bearing life is the harmonic balancer. It is common practice on some cars to replace it with a simple pulley when adding an SC. This is a much debated issue on various cars over the years in part because there is no single answer to cover them all. The importance of a harmonic balancer depends on many factors, but I think it’s safe to say that the factory spent money on R&D before going to the expense of adding one, so at a minimum I should be assumed that removing it will have at least some impact on bearing life.
The other, and possibly most important consideration, is that unless you have a dedicated track car it is unlikely that your engine will be significantly on boost more than a small percent of total run time. So in the end I personally don't think that it is a major issue if it is a properly designed, tuned and maintained system. But that's a pretty big if.