1) Probably low
2) Probably not
3) Many
4) Quite a few did, but they're either lazy or have other things they do with their time then maintain and support a piece of poker software. Hats off to Pat~

As for the OP - so long as you remember that PT stats are guidance and they're not telling you your opps' hole cards, it will not hurt your play. As for live game - if you truely understand what PT stats tell you, you can figure it all out as you observe the table.