I worked with FC for a while, and IP over FC was always a wonky kinda situation. It really made no sense that if you had a big expensive FC fabric, that you'd funnel your IP traffic through it.
It wasn't that much of a lift for most organizations to just have an IP network for IP type traffic, and leave their high performance FC fabric alone to do its thing.
The few situations when it was done was when someone had some rando traditional IP systems that you'd connect just because, but these were corner cases / kinda forgotten bit of equipment that you just were waiting to replace / time out kinda situations.
It wasn't that much of a lift for most organizations to just have an IP network for IP type traffic, and leave their high performance FC fabric alone to do its thing.
The few situations when it was done was when someone had some rando traditional IP systems that you'd connect just because, but these were corner cases / kinda forgotten bit of equipment that you just were waiting to replace / time out kinda situations.