Interesting; I'm surprised to see this comparison made, even though in retrospect (thanks to 'ujeezy for pointing it out), I recognize the PG quote about things "described as a toy".
The funny thing is; they've drawn a mostly different comparison using the same dichotomy ("toy" vs "serious") that I use for occasional rants on this site. I say mostly different, because here's the intersection:
If you give people a tool and tell them it will perfectly solve an important problem, any imperfection in the tool is going to make them angry. If you give someone a toy and say “Look what I made! Isn’t it fun? It kinda does this thing.” then you’ve set yourself up for a positive reaction. It’s much easier to beat low expectations than high ones, so you’ve materially increased your chances at having a happy user.
What I loathe about current startups and SaaS companies is that they seemingly can't - or don't want to - progress past the stage of a toy. I agree that when I see a random toy on the net, I'll have a positive reaction of curiosity. But then, at some point, I'll have an actual thing I want to get done efficiently. Suddenly, the toy becomes borderline useless, because it either can't help me with the task at all, or the help is very weak.
What I mean is: if you're trying to show that something entirely new is possible, by all means, make it a pretty little toy. But when your site is full of advertising copy around "helping users" and "making world (of niche thing X) a better place", then for the love of $deity, make your product functional and efficient.
The reality is, most SaaS startups seem to be toys in that sense, to the point (or because of) it infected the modern UX trends! UX people will tell you about uncluttering, removing functionality, "your user doesn't need that", "this is confusing", "put this in 'advanced options'", "actually, 'options' are confusing, drop it entirely"... For example, observe how, over the years, Google dumbed down its products from actual tools to pretty Material Design toys with a fraction of original functionality. And then people treat Google as role model...
So yeah, startup founders: don't treat yourself seriously, but please, try to actually work on the value you're saying you're providing to your users.