Are you suggesting that such ambiguity was purposefully inserted by Gygax (I really don't think so, personally) or that it arose "naturally" from the hostile dynamics between the Keep and the natives?
No? I mean, it is a style of play. The 5e campaign that I'm playing in currently (which is nearing its conclusion) is being ran - more or less - with this style and neither I, nor the 5 other players feel that the DM is a "tyrant".
Another fine way of playing, to be sure. There are many. Not...
One factor might be that in the OP you mention Shadowdark. I think that it's a great game and it's very popular, but it is not (and does not want to be) a retroclone.
Wikipedia says that it launched in August 2017 and I've been a member of the forums since March 2017. So, probably, in early '17 the site was up and in August they started selling products.
I agree. A clone, by definition is a copy, so it has to be as close as possible to the original while offering clarifications and better organization and accessibility. Games inspired by the spirit of older games can be wonderful, of course. They simply are not clones.
Ascending AC, on the...
As I've argued already in the thread, you have to decide at character creation to be a bard. It's not something you decide later on and this is why you don't follow all the rules for dual-classing; for example a half-elf, can't dual-class but may become a bard.
I don't know, but my...
There is more. In 1e, recovering spells takes a long time. At high levels, you can't unload all your spells and recover them next day. Also, a lot of spells had complications/restrictions that were removed or mitigated. Then everyone started to complain about broken casters...