What problem does this solve or what need does it fill?

Currently MAX_DIRECTIONAL_LIGHTS is const, which prevents us from setting it to platform-specific (detected at runtime) values. For example, we need to set it to 1 for Adreno GPUs on WebGL. Currently, we are hard coding the value to 1 on WebGL for all GPUs, which is unnecessary.

What solution would you like?

Make it a dynamic value set and read at runtime.

See #8505 for more information.