I believe that without lab analysis of the fluid, there's no basis for early/frequent ATF changes. And for me, it's always going to be "just the facts, ma'am", regardless of how many people on the Internet claim otherwise.
So at around 60K miles or so, I'll send a sample to one of the labs and use the results of that test to determine what (if anything) to do at that point and how to proceed going forward. That's my opinion, and I have no interest in arguing with anyone who would want to tell me how wrong I am about this, and how the transmission will already have become damaged beyond recovery at 60K.
No one said that and I quote you... "the transmission will already have become damaged beyond recovery at 60K".
Would you like to see an oil analysis and read all the good stuff in a MAZDA transmission?
Below is one I suggest look at the values.
Here is one of my analyses from Black Stone Oil labs.
I look forward to seeing yours!

I would recommend that you not wait and simply draw a sample from the dipstick area and send it to be analyzed. Please... oh and post your results. I like forum members that like to question information from any member on validity, experience and facts!
When you do get around to the MAZDA transmission service, please post the pictures of your pan and also the magnet. And how fun it was to clean both of them.
**I also recently posted what the varnish looks like on a valve body and that was on a transmission with less than 30k miles.
MY personal Mazda:
I run an addition auxiliary transmission cooler as well an inline oil filter have already done a complete fluid replacement and 3 basic pan filter servicing. I like to think that may be to some over kill. But in monitoring the effects of performance on a dyno regarding the transmission temperature's which are directly following the engine where MAZDA installed the sensors and what the real temperature's are it made me go WTF. So now I monitor 2 independent area's of the transmission temperature and watch that under no driving circumstance the transmission fluid gets over 185F returning from the sump back into the transmission.
I also went into the ECU and shut off the radiator fan control completely and installed my own auto fan and manual override control. Also I have removed the factory thermostat and install a cooler 170F thermostat, lowered the percentage of coolant to water, and have ducked ram air to enter the engine compartment at speeds above 40mph.
** see thread post # 19
2012 Mazda5. Did my 120,000 mile service today which consists of a through suspension, brake, and undercarriage inspection, rotating the tires, oil change, and ATF oil and filter change. Upon removing the old ATF, it looked a lot darker than I would like. My normal ATF schedule is drain and...
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