The question people should be asking themselves is why do the same sets of SPIKE issues continue to brought up over and over again since 2013, if supposedly there are no system design problems?
Part of the answer is quite simple, as there are more enthusiasts and collectors which are buying Stern games and were not aware of the changes in hardware, or perhaps simply do not care.
BUT, people really have no idea what is being changed except at the "macro level" between SPIKE I and II. This includes operators and associated technicians. It actually has become quite a bit of a running joke theme on PinSide (and other locations) to see opening of this same discussion nearly every 6 months or so. I have to disagree with any comments that ALL present SPIKE node boards are available from distributors. Based on discussions with various distributors any specific boards for titles before GB (WWE, KISS, GoT) are NLA, if not backwards compatible. I do not have confirmation regarding actual Spike I CPU units themselves, but I suspect there are only low quantities. WNBJM specialized SPIKE node boards would not seem favorable either. This means that EVERY game title in the SPIKE I series is highly subject to potential early obsolescence already in much less than 10 years. This problem will only accelerate as more SPIKE II games are developed in the near future.
The only system I find comparable to the SPIKE system from pinball history is the Bally 6803 from 1985-1989, which had its own share of problems based on the control board, but mostly out of misunderstanding of the implementation of the "multiplexing", reduction of SCRs, and the multitude of different sub-boards variations for display and audio for the titles. Although repairable, the 6803 CPU control board could be unfriendly to diagnosis issues and used that stupid keypad, but an owner did have schematics and components were through hole or socketed. Another negative were that certain IC components were hard to find. Ultimately, due to the lack of sales of many of the games, spare parts for many of the titles were not available soon after production.
However, schematics are not the "solution" to this overarching SPIKE problem, but are simply a start in the right direction to have Stern ADMIT that there are issues that must be addressed in longevity of their games and provide loyalty to their customers. Nobody wants to call Stern customer service for better technical knowledge and costs of replacement only to be told they are "out of luck" because the game is no longer supported less than 5 years from the date of manufacture. IMHO, this has already started happening.