I started a new game with the following settings:

After exploring for a while I realized that there is not a single luxury resource on my continent. Here are the screenshots of everything I explored:

I did further testing with the same exact settings without changing anything and the 2nd map generated had a luxury right next to me in the beginning. I tried a 3rd time and once again I can find no luxuries on the continent I'm starting at, here are the pictures of what I explored:

Attempt number 6 with the same settings, first it looked like there are no luxuries but then the map ended up like this:

Something is making resources very scarce with these settings, I have no idea what or if this is intentional. It doesnt feel intentional.
Here are all three saves in order:
NoLuxuriesWithMapGeneration.ctr

NoLuxuriesWithMapGenerationGame2.ctr

AlmostNoLuxuriesWithMapGenerationGame3.ctr

I've done even more experimenting now and it seems like it's very common for Huge size maps to have enormous areas with hardly any resources at all when using steep setting.

I've succeeded in generating 1 Huge map that had evenly spread resources and a fair amount of them as well with flat setting. I didnt manually save so it doesnt exist anymore but I took pictures of the explored continent and game settings, if they help with finding out the cause of this.

The settings used:

The exploration result of the continent I spawned on:

I would like to chime in as well that this is the biggest reason to have to stop and restart games every 50 turns. I continue to have these problems even when selecting abundance of resources in the game settings

1. The resource distribution is terrible where large areas of map have no resources

2. There are cases where a map is generated with no luxury resources at all

3. There are cases where not all luxury resources are generated, even on the largest map

4. Most island are barren and usually have no resources. I would love to see resources that are unique to island to make their exploration all the more fun

My preference would that all resources are in game to enjoy their beauty and benefit, that resources are evenly distributed on the map, I probably would prefer that resources are not generated around spawn points but require exploration to find the right first spot for an outpost.

Also there are some games where I would prefer playing on a large map, instead of huge, but my understanding is that not all of the resources will make it.