Exciting update! How does the new vector tile system handle performance on low-end devices with large datasets?
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One of the downsides of MVTs and the typical max zoom level of 14 is that that they do require more local resources than simply rendering a 256x256 bitmap.
For OSM the question is naturally would a complete migration (aka turning off raster tile support) exclude any noticeable number of people from contributing.
But right now that decision is still a long way off, the vector tile service hasn't even been integrated in osm.org yet.