Option 43 is the "new" way of doing it, and technically the correct way now.
128, 129, 130, etc. are the older way and work just as well. Your boss is correct that they are technically overkill, but sometimes are needed depending on the model phone. I think IP Page adapters require the older scope options, and if you're using phones with old firmware initially, they may need the old options in order to upgrade and begin to use the new ones.
My opinion, while yes they are overkill, because they're sometimes needed its not a bad idea to have them.