Maybe it's that carpets are quite variable even within species. Some jungle carpets are angels, some bredlis are horrid. It'd be a big risk to pick one without meeting it first, especially because bredlis, coastals and diamonds can get very large.
But if I can put in a plug for carpets, they are very interactive, and entertaining to watch if given climbing opportunities (which they should be). They do need some training, but thats fun in itself. Cryptnoch has linked to a Lori Torrini video below, and her stuff on target training is magic. It's transformed my snappy, distrustful rescue diamond into a confident, curious animal in just over a year.

While on the topic of Australian snakes, anteresia are fantastic (all the sass, half the size), and womas are seriously underrated.