About to start my first few PM's going mostly by Deathbrewer's write-up (thanks for that!) but was curious...
1) All the methods of PM'ing mention late, or close to end of boil extract addition. I plan to do this exclusively, any reason I can't do this every time?
2) Forgive my noobness but why can't you do an all grain with this method? Something to do with holding temperature in the mash with this method isn't as efficient and you can't get 100% of your fermentables this method?