I agree, but I would phrase it differently. I wouldn't say that beech trees are not easy. I would simply say they're slow. That is to say, as a beginner, I have had no trouble keeping established beech trees alive, but many of my first trees were beeches, and many of my newer trees are far ahead of those beeches in development.
Beech trees' horticultural requirements are simple. Use acid fertilizer and give them plenty of water, and they'll be healthy. I don't have problems with diseases, they heal over their wounds quickly, and they don't require much in the way of maintenance. They just need a bit of extra time to recover after rootwork, and they only put out one strong flush of growth per year.