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[Ziggi]

I may be able to shed some light here.

First yes it does matter if frogs can see each other, not only females but all frogs.
Many aspecs come into play but mainly stress and territorialism.
You may not be able to breed any of your frogs if they see each other for the above reasons, not to mention possible death due to stress.

Now thumbnails themselves in general are advanced care compared to tincs or other large frogs because of the reasons that they are much much much smaller. Which means that they are much faster, much easier to lose, fit into any little gap available ect... They are also much less tolerant to temperature and humidity extremes.
They require proper food and because they are smaller can not go as long without food as the larger fatter frogs. Thus being said they are less forgiving to begginer mistakes.
Does that mean you cannot properly take care of thumbs, not true. There is many species of "begginner" care thumbnails that are easier then the other thumbs to care for.
Try to stay away from Oophaga as they are obligated egg feeders and require advanced care, as well as ephidobates live in different conditions as most other frogs although said they can adapt well, they should still be left to advanced keepers.

So being said, thumbs are fine to start if your prepared and got proper research done, some do and some don't.
Vents, imi's, variabilis are all good thumbs and fun thumbs for starters I'd say.
Hope it helps!