Printing in RGB. Myth or reality?

Question

Web development

I came up with the idea of ​​being able to create posters, books and brochures using web technologies.
Of course, there are indesign, illustrator and many other utilities that are quite heavy, and their programming capabilities are clearly weaker than javascript and its frameworks, especially the general community of all sorts of bootstraps, foundations, angulars and other lodahs.
There are currently two problems.
1) This is the color space. The web is primarily RGB. But, with the introduction of CSS3, it became possible to set colors using Orthodox CMYK. It would seem that the matter is settled?
2) There are no normal "converters". In fact, there is the same built-in chrome print in .pdf, but it only supports A4, yes A3, and for sure converts everything to RGB. There is something Universal Decoder, which is also a printer, but allows you to "print" already in .tiff, and create DPI (at least 100500 per inch). The latter does not smooth fonts, but this can be corrected later by using the conversion of a very high DPI (> 1200) to an average 600dpi. But again, there is no color space setting in it.
Why is this all?
I was faced with a task, which boils down to the layout of posters, which are mostly text, and the graphic part is represented by icons. At the same time, there are two conditions:
1) changing content (and its volume)
2) hundreds of posters
If you catch up with 100 posters, and then it turns out that you need to redo the overall design a bit, then you won’t be able to easily change everything in 1-2 clicks, as it would be with CSS or, at worst, a js script.
And changing content in CSS styles is easily adjusted using margins and paddings. In the same Photoshop, this is unrealistic to achieve.
Disclaimer. Yes, you are just a crooked coder in indesign! you say. Let's say. inDesign is perfect? no. I'll draw an analogy. There is a backbone. Why do you need Angular or WebComponents at all. Why do you need an illustrator, if you can also do almost the same thing in Photoshop?
What do you say on this issue? Does anyone have any ideas? Maybe it's implemented somewhere?

Answer 1

For the question, it is not enough to clarify what printing technology are you going to use? You will probably launch hundreds of posters not in offset, but in laser or inkjet. Such printers do not care about the color space, the colors themselves will convert.
About converters. There are probably services like "photoshop online" on the network - can you dig in this direction?
PS: you don't need to offend InDesign. I have yet to come across a program that is as well thought out and stable as InDesign. And in Photoshop it is impossible to do much of what is possible in Illustrator.

Answer 2

If you catch up with 100 posters, and then it turns out that you need to redo the overall design a bit

QuarkXPress is a layout program. It is the layout of paper books, posters, etc.
If you use styles and templates, make up posters in one document, like different sheets - corrected the template or style - corrected all posters, corrected the source of one icon - this icon on all posters where it is used has changed to a new one.
I think there is a similar possibility in other layout programs, I just have enough Quark, I haven’t used others.