I really liked the ClassicPress concept and migrated a few sites years ago. However I gave up and reverted to WP mainly due to plugin incompatibility (lack of suitable alternatives to crucial plugins such as Woocommerce, Yoast, Wordfence) and also difficulty with support. I found the support forum to have a very clunky and difficult interface.
So I’m trying again after 5(?) years.
Plugins may be OK on some of the smaller sites at least, and I have no problem dropping some - the fewer the better I find works.
HoweverThe support forum seems just as awkward - it would be so much better to have a more intuitive platform such as xenForo, even bbpress might be better or something that works with Classicpress - what there is currently is hardly a good advertisement for CP.
I said all those years ago that we should run our forum on ClassicPress, but I was outvoted. I have repeated it since and I think most people now agree.
But it’s not that simple to do any more. We would have to work out the best way of migrating all the threads for a start. (And there’s a lot more to it than that.) So the forums will probably get moved at some stage, but not for a while.
However, my reason for wanting the forums on ClassicPress was to show off what it can do. I don’t see any problem with the functionality that Discourse provides, and I know plenty of other organizations that use it.
There’s a difference between something being objectively better and mere personal preference. It seems to me that this is about the latter. And that’s often determined by familiarity rather than anything else.