I absolutely agree! Most of these species should be kept solitarily (at least with no same-species individuals) or they will end up bullying or being bullied. The submissive ones will disappear on land for extended periods of time. For sure not a nice way to spend your life!
True, also, that some or the species will bask (many don't) and they very occasionally bury themselves on landm - but I've only rarely seen that in my animals (which are being kept solitarily and are producing eggs like laying hens).