The result of winning a bad bet is not a good basis for life decisions.
Ductal illogic comes from writing with a hand ~15% of the population finds unnatural, using a particular tool invented because otherwise not enough ink would flow, and most crucially is detached from the purpose at hand: reading. It's a mistake.
It should be itself, but one dimension of that is belonging to its group(s).
> Do you believe the S and O would be better capitals if they were implemented with hard top left corners?
I believe they would be better capitals if they were less like their lc forms; the ẞ can benefit from that too. But of course that's not the only factor, and it all depends on the spirit of the design at hand. I am in fact leaving room for various forms, with simply a preference for some; try it.
Leaning on the historical derivation of a letter is pedantry.
To repeat: even lacking formal instruction, ideally it should be eventually clear without sacrificing broad, long-term performance. After all, the least "obfuscating" would be simply using an ß on steroids – but that's not design.