My point about font sizes is probably more relevant to the computer-savvy, to use your term. They’re the ones who will know how to set the default to a size which suits them, and how to zoom it if they develop cataracts or other eye condition, break their reading glasses on their way into work, or whatever the cause may be.
The bottom line is that no matter your audience, unless you are actually, physically in control of the machines they use to access your site, you cannot know the conditions under which they will be viewing. To my mind, a broken layout looks unprofessional and gives me a poor impression of the company; if you think otherwise, so be it.
Once again, I’m merely trying to present facts - as much for the benefit of anybody else who may read this thread at a later stage as for you. What you do with the information is, of course, up to you.