This feels like such a ludicrous concept, but also I love it. I've recently fallen back into the world of building static marketing sites and the tooling is now so sophisticated, cheap and undifferentiated. We're solving the same problem over and over in very similar ways. I generally despise all-in-one solutions, but this use case actually makes a lot of sense at this point.
I don't know about ludicrous — this is essentially the same USP you get from Squarespace, Wix, etc., but just without the "and we host the resulting site for you" part.
In trade for not doing the hosting, it becomes just a native app you can own, rather than a subscription service. Just need a commodity web host to slap it up on.
I'm not sure I'd say the SSG is the only difference. Squarespace et al target non-technical users directly, so most of the code is abstracted away (which makes anything outside of the rails virtually impossible to edit). primo is first and foremost about enabling developers to build a static site without having to do the Tailwind/PostCSS/etc. setup while also getting a CMS so they can hand it off to a non-technical user.
> Just need a commodity web host to slap it up on.
I suggest NearlyFreeSpeech. It has an outdated UI and it's very DIY, but the pricing is very good. They have an option for static sites, with a lower price.