Actually the key word here is 'torn' boots vs 'cracked' boots. If the boots are cracked they can last for an indefinite amount of time. One of mine was ripped in 02 and required replacement in 04. Luckily I had a parts car with an almost new MB part to use for the swap. The other side had cracked boots in 02, and duh... they are still cracked but not ripped. However the joints have not exhibited any of the banging and thumping that the other one did. The reboot route just does not seem to be an economic gamble to me. Heck using a used half shaft from a JY on the opposite side of the car is likely a better gamble. The wear surfaces used when rotating in the reverse direction are practically new.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150