> The flaw in PPPoE is the small MTU (but it's hard to avoid in the
> general case, given what PPPoE tries to do).

How is this a flaw?  The actual flaw is in all the idiotic software
and/or configurations out there that blindly assume a 1500-octet MTU
(like hosts configured to do PMTU-D from behind firewalls misconfigured
to drop the ICMPs that drive PMTU-D).  If it weren't for such idiotic
setups, it would be more like "1400, 1492, 1500, 1600, who cares, it's
all about the same anyway".

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