"The bladder type tanks will allow oxygen to enter the system due to the bladders are oxygen permeable."

How much oxygen is in a diaphragm expansion tank and what effect would said oxygen make given the hundreds of square feet of iron or steel in a typical system? Once the oxygen has migrated though the membrane where would it get more? You are obviously confused.

How would say, 3 cubic feet of "oxygenated" air, trapped the diag. XT., compare with a couple of hundred gallons of water in a new fill.

The argument for old-fashioned steel expansion tanks is specious at best. Steel expansion tanks are a waste of precious time and money, but one has to admit they do make work (the only reasonable argument for their continued use).

Try to get a well driller to install one...no they quit using them 30 years ago, just like me.