That's some careful lawyerly language we got here, that skillfully avoids pointing to any direct cause and effect (perhaps for liability reasons?). But here' how I read it:
"Over the years, we also continually looked for ways to improve the saw itself to further enhance durability and longevity. Some of these changes were never specifically marketed as it is a normal part of the constant quality improvement process that we implement to provide the world’s finest power tools."
So, some unspecified number of years after the introduction of the saw in 2008, they made some additional tweaks to the Kapex -- not ones that added a new feature, but perhaps a change in the manufacturing process or materials/components used.
"In recent years, some customers presented machines that seemed to have issues related to the motor longevity. Some of these machines had been working in the shop and the jobsite for years under various conditions and others may not have had as much use. These issues were random and individual, and a bit perplexing for us and it is not a normal experience for our motors. While we attempted to work with every customer to provide a high-quality product and address these issues as part of our commitment to provide high-quality service, some of the issues became public and brought even more attention to these issues."
This is the most obfuscating part of the statement -- they acknowledge the motor issues that have been frequently reported on the FOG, but don't say that there was an uptick in these problems relative to before. And although the implication of their sequencing of events is that these issues follow upon having made the previous,unspecified tweaks, they are careful not to draw any causal relationship (and perhaps their investigation of the problem revealed there was none, or was inconclusive).
"Since 2017 we have made improvements to the internal structure of motor components to produce an even more reliable machine.
We are confident that users will no longer experience these issues"
This is the most frustrating part of the statement. If you haven't figured out the cause and effect between the unspecified improvements and the motor issues, how can you be confident that they will no longer occur? Alternatively, if you do have confidence, that means you have a ballpark idea of what the underlying problem is, even if you don't know definitively. I understand that they aren't obligated to tell us what they changed in 2017, but their engineers know, and so there must be a reason why they made that specific change.
From a corporate liability standpoint, I understand why they wouldn't want to give us their best guess if there is still some uncertainty involved. But I think given the hit that Festool has taken over these problems, it would be a good faith gesture to extend the warranty on pre-2017 Kapexes that have motor problems.