Offensive Line play has changed a lot over the past few years and that’s changed some of the roles and characteristics of those players, and much of it has to do with how defenses are evolving their schemes.
Tackles
In the mid 1980’s through the mid 2000’s the Left Tackle was going to be the elite pass protector on the offensive line. Think of legends like Rich Webb, Bruce Armstrong, Jim Lachey and UM great Bryant McKinnie. Defenses would often put their undersized Defensive End with pass rush speed to the QB’s blind side. In the Tight End - 21 personnel - era the LT/LG would be a pass pro combo while the RG/RT were more run blockers.