As far as I can tell, even on the latest iOS with WebGL2 support, the BJS PG’s seem to lack a toggle to go between WebGL1 and WebGL2. Is there such a toggle and I am missing it?
Good catch, it was probably to not bloat the UI, @Deltakosh might want to have a look at this one 
You can track the progress here: Add Engine Switch selection on Playground Mobile (WebGL1/2 and WebGPU) · Issue #10565 · BabylonJS/Babylon.js · GitHub
Thanks @sebavan ! Is there an API I can use in the meantime to dynamically switch engines, or at least specify the first engine to attempt loading?
You can by adding a createEngine function in the playground and disable Webgl 2