For a Blackberry Playbook a limitation now is to complete the logon screen at wifi hotspots - for example a standard McDonalds wifi logon screen or A&W logon screen
This is not an issue unique to Blackberry tablets - older Android 4 tablets seem to have the same issue with wonderful "security" features of browsers "protecting us"
Yeah it's a known issue... even back five or six years ago when I used a PlayBook.
.....and it'll never be fixed.
Antique platforms struggle with contemporary Internet, news at 11.
It's kinda amazing the BBOS devices did as well as they did, for as long as they did.
I don't see PlayBook OS, BB10 or Android 4 being very useful after 10 years (or even now).