I'm a 41 Mag fan, so my response is going to be biased. You listed all the reasons I prefer to shoot my 41 mag.

The 44 mag was here first and the 41 is so close to the same performance that folks just didn't see the need to change. Try going into the store and buying some factory 41 mag ammo. If you can find it the cost is going to be really high. If you handload, there just isn't much difference loading for the 41 instead of the 44.

But I also enjoy loading and shooing the 222 Remington Mag, 257 Roberts, and 280 Remington. So it just goes to figure I would prefer the 41.