I would never say that people are incapable of it, there are plenty of people and applications that do a great job!
However, I would rather (and encourage everyone to) spend time building the value that my application provides than setting up auth every time and all the associated things that need thinking about. :)
I would encourage everyone to read and play around with learning how authentication works and the principles, however that is not a reason to roll your own out into production.
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I would never say that people are incapable of it, there are plenty of people and applications that do a great job!
However, I would rather (and encourage everyone to) spend time building the value that my application provides than setting up auth every time and all the associated things that need thinking about. :)
I would encourage everyone to read and play around with learning how authentication works and the principles, however that is not a reason to roll your own out into production.