Saying you dont have to have a stroke to play on a bar box is just wrong, to play good pool on any table you have must have a repetable- approach, stroke, and finish to each shot you take, granted it might be a bit different than on a larger table. but a stroke is what your game is made of. Look at the snooker players on a 12' box they use a different stroke that the players do on a 9' box and the bar box players use a different stroke....but everybody has a stroke that can play, only bangers dont have a stroke.
With propler CB control scratching will happen a bit more on a smaller table and the least on a 12' table but good players can see the screatch shots before chosing to shoot them and then use a BIG stroke to swerve the CB to avoid the scratch thus a srtoke is as important no matter what size the table,
as far as 7' boxes being easier sure they are and just as easy for the other player so there is no advantage there, I like 9' & 12' tables the best, but thats me, bar boxes especially the new Diamond ones are great and I believe the way foward for pool. I have a great stroke(I look like I play better than I do, until you watch me for 15 minutes) but now that Diamond has quality 7' tables i'm gonna start playing on them from time to time, I refuse to play on Global or Vally shit boxes, And yes I will 100% have to adjust my stroke, but its still a stroke.