<troll> Why fork Drupal when you could just switch to WordPress? </troll> ;-)
WordPress begat Ghost
Drupal begat BackDrop
Interesting to see the bifurcation of Pro vs. Amateur in both... and this discussion around the 10th anniversary of WP:
On the Sympfony note: the learning curve is *brutal*. While just about anyone who knows PHP can pick up basic WP development in a day, you really need Symfony devs (or a several week burn in period) to make progress on a Symfony project. So costs are higher, talent is scarcer, etc. There are cons to a Symfony route...
But corporate IT rarely considers practical factors like these, they just want the new hotness, or a "more secure' platform... as if custom code not vetted and attacked daily by botnets is more secure (hint: it's probably not).
Ok, rant over... hope this was helpful ;-)
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Nick Ciske
@nciske