Re: So the bar is now much higher for e-cig makers
No, it really really isn't.
A hard hat is a piece of safety equipment whose only purpose is to prevent you sustaining head injuries in a dangerous environment. Any negative side effect a poorly made hard hat might have (such as your mention of scalp disease, if such a thing exists), is still infinitely preferable to a fatal head injury.
Consequences of wearing a (scalp disease causing) hard hat vs not wearing one?
You may get scalp disease but you're alive.
Consequences of inhaling tested and regulated chemical formulation vs untested and unregulated ones?
Your fluids might cost more, but there is now a much lower chance of you inhaling something with dangerous or even life threatening properties.
Despite the endless amount of positivity E-cigs have towards them from many quarters, they are still essentially a device design solely for the purpose of taking potentially toxic substances into your body. They are not, unlike a hard hat, a device with a safety or health purpose in mind that might have unintended negative side effects. All they are is a "possibly" safer, that is safer not safe way of doing something which is known to be harmful.
The "possibly" there is important because while many government bodies will accept that e-cigs are in the short term clearly less harmful (and it's important we use the phrase "less harmful" and not "better for you", they cannot and will not comment on the long term effects of e-cig the technology simply has not been around long enough for anyone to know if there are any serious side effects from substantial long term use.
On top of that up until now there has been no regulation of the substances you're choosing to inhale, you have no assurance as to content and safety of the liquids you are inhaling.
Are E-cigs a good way to get off cigerettes and then tape off smoking/vaping altogether over a short term period? Absolutely.
Are E-cigs better for you if you just replace your heavy smoking habit with a heavy vaping habit for the rest of your life? No-one knows, it could be, but equally it could turn out that long term inhalation of vapourised nicotine and other chemicals has consequences we don't yet know about, particularly if those chemicals are untested and unregulated.
Don't even get me started on the quality of the electronics in these devices causing fires etc...