This is just the old argument in favour of SaaS, though. The article is pointing out that those long-standing rules may no longer make sense, in a world where 1. it no longer takes even a weekend to build the niche, perfectly custom tool and 2. the maintenance / feature requests side is also just a prompt away.

At my job (we're somewhere in the transition between startup -> enterprise), we still use a lot of SaaS and are continuing to do so, but even there we're starting to move off certain platforms (Pendo, is a recent casualty) as we've realized in many cases we can just build it ourselves, pay drastically less, and actually get to control how it all works.

My suspicion, though I could be wrong: SaaS will move more and more towards focusing solely on the enterprise. Personal users and startups will have a harder time justifying both the cost and lack of flexibility of pure software SaaS. Enterprise will continue to be ok with paying the costs in exchange for compliance and vendor stuff and integration and whatever else they care about.