It is very simple. If you don't pay people enough or their working conditions aren't good enough they won't work for you. You may only think that the work is worth $X but if people won't work for anything less than $Y then you're going to have trouble getting people to work for you if you only pay $X.

The Alberta government could stop spending $30 billion on corporate welfare and instead spend that paying teachers what they are worth. Of course, ideologues like Smith don't like high quality fact based public education because better educated people tend to be more liberal.

I like how you know that some classes are too big to manage. You list several considerations a teacher may use to determine what is and isn't a manageable class size. Then you turn around and use that to argue AGAINST class size limits.

You apparently oppose any class size limit because "it doesn't perfectly resolve every situation", leaving the teachers with no class size limits and no tools to resolve the very real issue of managing large class sizes.

This is a perfect encapsulation of conservative logic.

1.You see a problem you agree is real 2. You see someone's proposed imperfect solution to the problem which certainly would shrink the size of the problem but not perfectly solve it. 3. You oppose the solution because although it would shrink the size of the problem, it's imperfect and doesn't solve the whole thing all at once. 4. You don't propose or support any replacement. 5. The problem continues to grow unresolved, and you're satisfied having done a good job stopping any kind of progress whatsoever.