Tapatalk started out OK for us, people liked it, and it offered a good way of access to the forums at a time when mobile technology wasn't all that good.
Gradually ECF changed and we introduced some more interactions, including forms for some types of input, such as entering items in the Classifieds. TTcouldn't handle that so it had to be blocked. That was OK as people could now use decent browsers in their mobiles, so TT wasn't crucial any more.
However TT wasn't coded 100% right originally and it meant that old versions of TT don't comply (with anything) and this causes a maor problem: current TT users are handled correctly but old versions cause chaos. So, now TT is on our list of major PITAs we can well do without.
It's a toss-up if we block TT entirely or put up with the chaos. Currently we're putting up with it, but the day will come when we have to cut TT, even though it has a lot of users. You just can't put up with a rogue app forever.