RE: trailing edges
Squared off is seen as sloppy or lazy. If you build a model to sell it will get pointed out right away.
If you leave them square on a Jet or scale subject they Will talk about you behind your back for the above. Never see that at TOP GUN do you.
Now on a sport design airplane , (trainer etc) nobody would really care as that is normal for newbies to do. Does it effect the sport plane, Not really, you'll never notice.
And yes all you guys that leave them square and have been doing this hobby a long time....
WE ARE TALKING BEHIND YOURE BACK