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mnawij:
Nermander, actually no, there is a visual difference with the higher resolution. RIP printing is actually LPI = lines per inch, see this calculator https://www.easycalculation.com/unit-conversion/dpi-to-lpi-converter.php.  It is just easier to talk to the customers in terms of DPI, something they understand.  Most RIPs until within the last decade did a maximum lpi of 200 which converts to 400 dpi, before this the maximum was 150 lpi which equated to 300 dpi (see https://en.wikipedia.org/wiki/Lines_per_inch), this is why most printers recommend a minimum of 300dpi but if they have a new RIP, then they should be requesting higher dpi resolution.  The only drawbacks to the higher lpi/dpi is process time when imaging the film or direct to plate and it theoretically will burn out the imaging laser faster so some shops still run the output at 150-175 lpi which as you mentioned still looks fairly sharp.  Hope maybe this clears it up.  So it does not hurt to ask what lpi your printer is using and adjusting images accordingly...

Cheers!

mnawij

Nermander:
LPI is as far as I know only used for half-tone rasterization. For other types of rasterization DPI is more often used.

In the past almost all RIPs used half-tone rasters, today there are a lot of rasterization methods.

This page contains an image illustrating this fairly well.
https://aiganhvt.wordpress.com/2009/01/23/understanding-dpi/

And if you scroll down to the DPI section of this page there is another good image (showing square pixels made up of tiny dots).
https://99designs.com/blog/tips/ppi-vs-dpi-whats-the-difference/

mnawij:
"All you can do is recommend your client to a professional print shop and have the shop, which will know the specifications of its machines, take over from there." This is the very last line in the article, all of the information in the article is for desktop printers, not for high end RIPs which is what is at most print shops.  LPI is still what matters for these... now digital presses are completely different than offset presses in this regard, the articles you shared would be correct in that instance.

Regards,

mnawij

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