Why does it seem that everyone thinks FOST is so hard to farm?

That was one of those I cherry picked to farm now and again since start - it was about a year before I had them 7* - that they would be needed eventually was obvious.

Some things are intentionally 'a pain' to prompt people to spend crystals to make it 'less of a pain' - those, and others with a single hard node - just need to be hit every day or so and just let it ride out, or pay to have it sooner.