I don't know, I'm sorry.
I've been accessing the forum for some years now on iPhone, starting with the 3. The one single issue which I still find annoying is the small size of the "view first unread in thread" icon.
In the last release of iOS they partially fixed an issue with pop down boxes such as the one used for searches. But giving kudos with an explanation is still difficult.
Apart from those quibbles I'm ok with things.
One potential benefit or drawback with something like Tapatalk is that it makes the forum a lot more visible, showing up on lists. Spammers love those. Sim has done a heap of work in spam protection- but even then it still pops up.