They can choose, but it's a false and forced choice since the benefits of MF swap outweigh the cons tremendously. That's why most people do it, as per Blizzard's post about the subject today.
Nobody forced me to play that way. I tried it, didn't like it, and decided to combine my MF and main gear. Again, if the downsides weren't significant then people wouldn't complain about it. You can play through and beat this game quite easily with 0% MF.
I and others have already told you that your "cons" don't matter to ranged classes. It didn't matter for me when I played wiz and DH at all. You can look at the streams of other people and see that they do this too with hardly any problem.
Not everyone is only picking up the best drops, sure, but that's because they are willingly choosing to play non-optimally for whatever reason.
Yes, you and one other person out of the millions that play. Those cons are absolutely concerns and all of them effect each class equally. If those don't effect you then you're in the extreme minority. Not everybody can 100% dodge everything the game throws at them while swapping gear in the process.
Bold applies to MF. Ty.
Like I said, your cons are not actually present in the way that people play the game currently. Tanks don't necessarily help that much since their mere presence in the game increases mob HP by over 100%, and decreases your MF since the tank can't swap out like ranged can, so most don't bother with it. Note that there are multiple posts from people complaining about how their MF got messed up due to other people joining their game.
Yes, they are. They're absolutely 100% "present" in the game. Less inventory space is UNDENIABLE as a con for using MF gear on switch as opposed to working it into your main gear.
Tanks do a lot of damage now and let the cannons do more damage. If someone is tanking that extra HP is negated by me being able to stand still and hold attack instead of wasting time on kiting.
Already said tanks can have MF gear on switch. They just need to make sure it has some res and/or vit which isn't very expensive.
It's a pain in the ass for melee, not for ranged. And it's even less of a pain in the ass when you can simple do it with one keystroke.
Having to kite while swapping gear is more of a pain in the ass than kiting without swapping gear.
"one keystroke" switch is not part of D3.