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It's okay to make things that aren't intended to become popular or to take over their niche commercially. Haiku's makers loved BeOS and are just remaking it. It's very charming and human.

This is tangential to Haiku, but maybe security shouldn't rely on the concept of users (ahem, EROS, while we're talking about obscure dead OSes).

The iPad seems to be doing ok with that limitation.

The iPad does not have that limitation. Applications are not run as root. If they were there would be no need for jailbreaking.

That's not true, Applications could still run as root but be signed and subject to approval as they are now. The only difference I can think of is they just wouldn't be sandboxed any longer.