I think the point they are making is people have more than 6 F&F that they help sort tickets for in the sales and thus is going to cause issue, not that they cannot transfer to more than 6.
But you can only buy 4 per transaction (aways currently 10 but can see this changing)
If you need more than 4 you should be logging in as someone else really
Besides, you will only see the game the lead supporter qualifies for going forward. So for example I myself cannot login and buy away tickets on peoples cards that qualify
I doubt that once I have bought my own ticket for a match, I cannot login and see tickets in the additional or local sales, as I already have a ticket and I'm not local