In my experience, with all business applications, this is almost never actually true. If the application is, in fact, “I/O-bound,”
If your "experience" is confined solely to yet-another-shopping-cart applications bolted together coding-by-numbers style from a bunch cpan modules, that may be the case, but "business" covers a great deal more ground that a bunch of mom&pop retail outlets.
There are a huge number and variety of cpu-bound business applications in this world -- else (for example) there's be no market for about 90% of IBMs hardware offerings -- finance; insurance; oil & gas; pharmaceuticals; entertainment; shipping & logistics; aircraft manufacturer; car manufacture; genomics & agriculture; the list goes on and on.
Dismissing the need for performance because your web app can't utilise it is extremely short-sighted.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.