Sorry pipe fab but don't really think you are correct. I've sold Lindes and they are not shot after 5 years. Just a simple example. Had a customer that operated a Linde E15C 3 wheel, 3k, 24v electric , triple side shift in a manufacturing operation (bolt machining - oil & shavings forever present) and finally traded it in after 18,800 hours (main reason the battery & charger were shot - truck was still running fine) on another one.

No doubt the ICE line are niche machines, that work well in "dirty, nasty" operations like block, paper recycling, concrete, ready mix, lumber and hold up well where others have tried.

I do understand when a lease (capital and operating) matures but explain to me and others when does a purchase mature?

Like any product the first line of customer support is the local dealership. I worked for a dealer that the first line was the Linde line - the parts support & trained service techs was there.
If a line is not the primary line of a dealership then often, not always, the support is not where it should be.
No doubt all lift truck companies have experienced extended lead times on critical parts, especially those that are proprietary and are sourced from across either pond - saw that on Manitou, Mitsubishi/Cat, Komatsu, Clark, Lancer Boss. For starters, it is difficult to to cut shipping time on the 30 day boat ride & impossible to expedite anything through U.S. Customs (if you try - you'll succeed in getting moved back to the end of the line). Air freight is not out of the question, except for the freight cost charge.