It depends. If the wheels with pickups on the locos are spread apart farther than the length of the frog, then they should span it and pickup from outside the frog. If you have some short wheel base locos and using long frogs - ie 7 1/2, maybe you need to.
It does increase reliability but by how much is opinion.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .