In short -- does a technology pull them away from their faith, or is it needed for a greater good? Not to mention, that each Amish community is independent and sets their own rules (there is no central Amish version of the Pope, for example).
This decision matrix isn't unique to the Amish -- people do it every day. For example, I want to save money. But I also want to work at a job. To get to the job I have to travel. I choose to drive to the job (incurring vehicle expenses), whereas I have the alternative of walking (would take several hours) or cycling (too lazy, too cold). Therefore I choose to spend money on gas instead of either not working or walking to work.
It's not so much the experience change I'm pointing out, rather that that will bring foreign influence from outside (and obviously foreign influence has occurred because they are using tractors and diesel from the other comments.)
And if we're considering a decision matrix that tries to minimize outside influence, that still doesn't explain why the Philippines vs any where in North America, really.
Yes, that does lead to some oddities.
Maybe they considered, quite correctly, that poorer people in disaster stricken areas are easier to influence.
Likewise, flying on airplanes or taking the occasional train on a one-off trip isn't really that big of a problem, either: you aren't tying yourself to the rest of the world. If you go on a mission this year via airplane, it doesn't compel to do the same thing next year. On the other hand, buying into automobile culture to commute to work ties you pretty hard to everything.
That doesn't seem like it is a contrived choice designed to enhance convenience.
(My understanding is that the choices tend to hinge on whether something creates an ongoing reliance on the greater world)