While I am only one person, I dare to say that I have probably bled more brake systems and or replaced more SMC units on ST1300's in a year, than the average or normal dealership will do in many years.
While I have seen ALOT of defective secondary master cylinder units, rusted guide pins, bent clips, and wrong parts being used, I will also dare to say that none of these issues were caused by Honda's complicated LBS or ABS system.
Most, if not all, were caused by Neglect, lack of service, or incorrect service. While I have seen many of these bikes that were in desperate need of repair/service, I have seen many more that were very high mileage, in the 175000 to 250000 mile range working perfectly because their owners followed the service recommendations and intervals and flushed and bled their brake systems as directed, if not sooner (depending on climate and weather).
It may surprise some, but most of the bikes that have/had brake issues, were low mileage, garage queens, that were washed and waxed and looked very nice, but sat a very long time in a cold or damp place, and the owners failed to keep up on the service.
My suggestion would be purchase a MP Brake bleeding tool, throw it in your tool kit, learn the system, bleed it yearly, and ride your bike until you wear it out! Which could be way longer than you think possible.
Igofar