Maplibre is certainly weak in the "GIS front" like coordinate transformation or WMS stuff etc.

But yes, the one big feature missing in openlayers is Web GL support for vector tiles. There was some support for this but due to bugs (or something else?) they removed it in the latest version. Note that openlayers has Web GL support for e.g. point cloud.

I do wish Openlayers did WebGL better but I found Mapbox to be far too primitive to do anything beyond your basic map views and interactions.

Once I got to "user has to author their own city data on a dozen layers" it was missing a lot of authoring features required.