Stephan Livera did a pod (456) with the creator of ordinals. I understood that if the blocks are full of fee paying financial transactions its unlikely to contain an Ordinal one.

So in essence Ordinals are space fillers when the Mempool is quiet that provide a small fee benefit to Miners. Not great for Node runners as the average block is bigger, but also not likely to be around once the fee market is stronger.

The bigger thing I cant get my head around is that its all make believe based on an arbitrary method of first sat in first output.