This is why entire schools or school districts should sign contracts with certain vendors of calculators. If a district picked a certain brand, then different teachers would be able to work together or with the vendor that sold them on how to do certain things on them. Teachers could call a support line to get help and so on.
The only way that change will happen is if there is competition in the market. And the only way that's going to happen is if entire school districts start diversifying what they're using.