One of the most persistent attacks on the teaching profession over the years has been around the issue of seniority. Lawmakers have been chipping away at seniority, believing it saddles schools with ineffective teachers and forces younger educators out of the profession. But experience matters. A lot. The more experienced an educator, the better able she is to address the needs of students because she’s dealt with just about every learning level, behavioral challenge, engagement strategy and classroom management style.…