Description:
By default the renderer resolution is capped at 1920x1920. This was introduced back in 2018 with #3641. There are a couple of downsides to this:

• Screen resolutions have gone up, making it likely that this cap is hit in everyday configurations
• Exceeding the cap might go unnoticed, or the resulting blurriness can be difficult to attribute to this cap
• The width and height take devicePixelRatio into account, which is inconsistent with Three.js ("device pixels" vs "CSS pixels")

I would propose changing the default values to -1 making it uncapped by default. Users can always opt-in to capping the size if they have a specific need for it.
Otherwise it wouldn't hurt log a warning in the console once the cap is exceeded and possible increase the default cap.

• A-Frame Version: 1.5.0
• Platform / Device: all