Dr Greg,
It somewhat depends on your experience.
I have had my bike 2 years and at 26,000KM the chain and sprocket have lots of life left. I lube and clean my chain about once every 2 weeks. I spray lube on, wipe excess off with a rag - thats the clean bit - done. It really helps to have a centre stand to do this.
Quite a few years ago, I have a BMW R100GS that had 14,000KM on the clock that broke the rear paralever uni-joint at speed and locked the rear wheel at speed in the middle of Western Australia.

. I am not a control freak and I know most shafts are fault free and I know chains can break and lock the rear wheel BUT I have some control over chain maintenance and replacement while a broken shaft is BANG...... No control over that. Some German engineer is in control of my skin integrity.
I am not flaming but to me, a chain is easy to maintain, weighs less, adsorbs less engine power and are actually pretty cheap to replace.
Not adding 10KG or so to the MTS is a good choice.
And yes, chains have come a long way. When I was a kid I would ride on sand hills that were sand mining tailings that looked like sand off black sand paper and were basically carborundum grit. Want to see chain wear when there were no o-rings or X-rings! I could leave home with a well adjusted chain and come home with chain links literally dragging on the ground and a tinkling noise and the stretched chain chewed out the aluminium rear sprocket and spread silver fairy dust on the ground.
And P.S.
About chains on bikes. Seen this:
Mad string driven bike. Looks complex and heavy but no oil on the chain. If you are interested, Google "stringbike". I seriously like this but it won't fit on my front wheel drive recumbent without serious engineering.