I think it's a sane practice to keep the marketing landing page on a separate domain than the product in case of SaaS.
Why? I always get frustrated when I end up in some parallel universe of a website (like support or marketing) and I can't easily click back to the main site.
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Could you elaborate on why? The companies I have worked for have pretty much all used domain.com for marketing and app.domain.com for the actual application. What's wrong with this approach?
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