Wow I can't believe how much distaste there is for the Pandora keyboard.. I've typed over 300,000 words of stories on it... and I've had no issues..
I think it's a combination of you finding a good fit for your hands and tastes, and I'd bet you haven't been spoiler by a really excellent keyboard.
I'm surprised you've been able to type that much. Shocked, really. There has never been optimal lighting where I can actually see the writing on the keys without being stabbed in the eyes by glare. Touch-typing is impossible with the round tops and wobble.
Touch-typing is impossible anyway on a keyboard that size, unless you have small fingers.
The glare is annoying indeed, but irrelevant once you are sufficiently used to the keyboard. Blind thumb typing is surprisingly effective if you have Shift on a shoulder button. For that reason I don't really care about backlit keys -- it will only be useful to me in the first few dozen hours of use, and only if those hours happen to be in the dark, which is not my typical ambient lighting condition. After that, typing is blind anyway.
I have coded 6 programs from scratch on the Pandora keyboard (3 games and 3 applications), in total about 20,000 lines of code. I am currently writing a novel on it, I wrote about 35,000 words (about 100 pages) so far. I have also written many meeting reports on it, no idea how much text that is in total but probably quite a bit.
I am generally happy with the Pandora keyboard as is. The areas where it can be improved are mostly already taken care of in what has been said about the Pyra keyboard. On the Pandora, the keymapping for symbols does not make sense, the number row is too hard to reach, a dedicated TAB and Compose key would be very practical, as well as shoulder buttons for Alt and Fn/Meta. I think/hope this will all be fixed in the Pyra keyboard. The keys themselves are quite good for thumb typing -- the relatively long travel ensures that you can feel the keys without having to worry about accidental presses. While the amount of force needed to register a key press is too high for comfortable touch typing, it is perfect for thumb typing.
So I hope the Pyra keyboard does not change
too much compared to the Pandora keyboard. Flat keytops could be fine, but I'm slightly concerned that this might imply either less key travel and easier accidental presses, or the same travel but more wobble. Also, a different material for the keytops has to get the balance right in terms of texture/grip: I think the Pandora keyboard material is a bit too slippery (but it's not a big problem because of the dome shape, which helps to get more grip), if the keys become flat the keyboard may become too slippery, depending on the material. Of course I don't want to type on sandpaper keys either, but the balance has to be right.
And of course the main use case to optimize for is handheld thumb typing. Putting it on a table for touch typing or two-finger pecking is something that has to be taken into consideration, but without compromising on the main use case, which is handheld thumb typing.