Why are thumbnails harder to care for?

[Evaradero]

And also with thumbnails, the construction and designing of the vivarium must be alot different than lets say tincs. Tincs you can just heavily plant the viv and there wont be too much conflict being that they dont see eachother. But since thumbnails climb everywhere and like to spend their time in the upper regions of the tank, there needs to be alot of visual barriers. Bromeliads, drift wood, ledges all being good ideas. They all need their calling spots (they mature and call at a young age) and that may be a difficult part when dealing with thumbnails

[DigitalPunk]

And also with thumbnails, the construction and designing of the vivarium must be alot different than lets say tincs. Tincs you can just heavily plant the viv and there wont be too much conflict being that they dont see eachother. But since thumbnails climb everywhere and like to spend their time in the upper regions of the tank, there needs to be alot of visual barriers. Bromeliads, drift wood, ledges all being good ideas. They all need their calling spots (they mature and call at a young age) and that may be a difficult part when dealing with thumbnails

That is not entirely accurate. There are some thumbnails who get along great in groups and even do group breeding like Ranitomeya. They do enjoy a good planted tank with lots of vines and such to climb in and on.