Is this task about loading the large datafile with all of wikivoyage data points, or is it about when should we enable/disable leaflet poi clustering plugin?

My opinion is that we should by default, and if there is a demand for it, allow users to turn it off with an attribute. One thing - in the images above, the ungrouped markers on the right side do not show with the original icons. I presume this is simply a demo limitation, not the future behavior.

I took the freedom to change the ticket a bit. While implementing T304076: Nearby feature for maps we used a different clustering library that eventually will replace prunecluster and the Wikivoyage nearby feature. There were already some questions from the community on giving clustering to features added via mapframe and maplink so I wanted to give these requests a new more up to date home where feedback can be collected.

Disclaimer: WMDE Will will most probably not have the resources to work on this.

I'm also a bit weary about this ticket to begin with.

You see, clustering is really useful in an interactive mode where you have a lot of data, especially if that data is more 'optional'. But the maps made by our users generally are very specific and pointy. Many will actually want individual points for some of the markings. If anything, I think it will be more worthy to explore the option of adding smaller map markers, so more dots can be shown at once. There have been several requests for that, yet Im not aware of a single user having asked for the functionality in this ticket.