I find that opinion pretty shocking, because it's terribly limiting. There is huge scope for establishing credibility with potential customers, branding, etc, dependent on a service oriented website NOT being limited to being an online brochure.
Just had this conversation with someone looking to set up a website for car detailing services, actually. An online brochure just ain't going to cut it for him, and I can't really figure how it would work for any businesses that aren't completely established in their niches.
...maybe it's just me.