Your question is interesting and legitimate.
"Why the heck?" And you've already given the answer. "To each Their Own."
But now I will try to give a more complete answer.
I am a biker and a traveler, I call myself a "motoviaggiatore" (in English I think we can translate "motorcycle traveler"). I like to travel by motorcycle. Only with the motorcycle, and the motorcycle I just like if I travel.
I traveled with my bike in 64 countries: all the states of Europe, half of Asia and North Africa. I arrived with my bike at the farthest point that I could reach by land, starting from my house (Lecce, Italy): Vladivostok, after more than 13,000 kilometers and 15 days of uninterrupted driving from the Mediterranean to the Pacific. And in Vladivostok, after visiting Japan and Korea, I rode the bike and I went back to the same road.
I want to make a trip that should not turn the bike back, I want to keep on going, this is the meaning of my around the world.
We in Europe do not have nearly as the problem of borders, often even now descend from the bike to cross a border, a quick check with a customs officer distracted just watching our document.
Outside Europe, it changes everything, and, as Europe I "finished", I already know I'll have to deal with these challenges border.
I have dealt with the customs of Egypt, Mongolia, Turkmenistan ..., what I find during my RTW, then they will not be too much worse than the old ones.
But in a journey that goes out of the good old, simple Europe is this normal, I would be delusional if I thought it's all easy. If I wanted to only drive on nice roads, would not go out of Europe, which has some amazing roads and better suited to the bike most of the states that will cross, and indeed may not even get out of Italy that I consider the most beautiful country in the world (along with the mountains of your Switzerland). But I am a traveler, not just a motorcycle, a motorcycle traveler.
At a RTW also borders difficult have their charm, are like salt in a dish: no, it would be bland. Are an additional challenge, as well as the miles, the roads, fatigue, sun, cold, heat, accidents. The whole makes a RTW. According to me.
Regarding your predictions on the timing of the couriers, I have organized so (see the four specific topics that I opened).
With the courier in Kathmandu I have already made arrangements, set the price and time, in two days I'll be ready to go. If he's late, do not pay him: he wants the money and then do the work. Already has the measurements of my bike.
From Malaysia to put the motorcycle on the plane is simple: lots of riders have told you did in one day alone.
In Brazil, my correspondent has already documents, and my bike, to save time. The ship (from Argentina) I can not take: it's too slow compared to the plane. And then I want to get in Brazil: no turning back (or I stop) in Argentina.
Australia are almost already building the case.
A 2-month RTW is not organized at the last minute, but with method, precision and tenacity.
One last thing: I want to make the RTW, but I do not want to leave my family and my job for more than two months. So I will do my RTW in two months, and I will continue to do so, because, after all, I like to travel so fast.
If I give up on such trips because they're too fast for many, then it would limit my horizons and do not want to limit them.

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www.gold-wing.it -"The aim is the road"- RoundTheWorld
Marcello Anglana - Gold Wing 1500 - km 915,000