Is XForms a failure to learn from?

All,

Having a look at AB/2014-2015 Priorities/w3c work success 
(https://www.w3.org/wiki/AB/2014-2015_Priorities/w3c_work_success), I 
can read that XForms is one of the "failures to learn from".

Surely, there is a lot to be said about XForms as a failure. In this 
list of "failures", I would personally add XSLT and XQuery for very 
similar reasons, and surely SVG some years ago, if they all had to be 
considered as effective Web, or client-side, technologies.

What do you think? Shouldn't we write what has to be written?

Thanks!

-Alain