I have had 2 x CX5’s since 2013 (both diesel, sorry to rub it in!) and both with iStop.
There are quite a few things that you can do to stop it from stopping the engine if you dont want it to. Apart from pressing the iStop off button, that is!
The simplest, and one you quickly learn and adapt to, is brake pedal pressure. The iStop system is very sensitive to brake pressure, so hold the pedal pressure just lightly, just enough to stop the car, and it wont activate. But if you see the traffic ahead is all stopped and going nowhere, firmer pressure on the brake pedal and iStop will stop the engine, unless there is another reason why not. Such as air conditioning not cold enough, or too much draw from other sources on the battery.
If you are wanting a really quick getaway from stopped, eg you can see a gap in the traffic coming soon, and the iStop has turned the engine off, just ease off the brake pressure and the engine instantly restarts. Then you are 100% ready to zoom off with no delay at all.
Having said that, it really is so quick to restart the engine that side by side at a red light with another car, you are away just as quickly as them anyway.
Also any tiny movement if the steering wheel and iStop wont stop the engine.
Really, most people get used to it fairly quickly, same as any other new thing.
By the way, I went to your US autobarn batteries website and did the “select a battery” thing for a 2016 CX5 GT AWD and it came up with several AGM batteries. From what I am told by battery people here, an AGM stop/start battery trumps any EFB battery, so I dont think you will have too much trouble getting a suitable aftermarket battery.
Mazda here replaces any failed factory fitted batteries within the first 2 years anyway (Panasonic warranty so no skin off Mazda noses) so you have a while before it will be an issue.
https://www.autozone.com/batteries-...ery/duralast-platinum-battery/377104_939658_0
Just, for heavens sake people, maintain the battery properly - keep the electrolyte topped up regularly, and put the battery on a multistage smart charger if the car isnt going to be used for a week or more. 7eregrine, thats not aimed at you, just seems that many in the general population and even on this forum seem to assume they have totally maintenance free batteries without actually looking at their car’s battery, and seeing the little filler caps there waiting to be opened and checked!