Ha! fullcapwearer,
I'm not here to say what you (or anyone else) should or shouldn't do, or what is right and what is wrong.
Especially as I've only tried one brand for one brief reattachment.

All I can do is give out the experience and information that I have and after that, people have to make their own decisions based upon their needs, requirements, lifestyles etc.

Attachment methods are notoriously individual.

All I can say is that if I decide to go ahead with using eyelash glue, I will certainly be giving DUO a try.
If others have tried several brands and are saying that DUO holds the longest, then that narrows down the choices for me and seems a good starting point.

The real benefit for me will be being able to buy something that I don't have to order, pay P&P for and worry that it will go 'off' in transit, because it got too cold.
So my criteria will be what works for me and is readily available in the UK.

You might have different priorities.