Easty, you realise this is a construction site saw, right?
While I understand that some of these things may frustrate the heck out of people paying thousands of dollars/euro/pounds for a saw with Festool written on it, it was simply not designed or built to provide a capability for precision that would rival or substitute for a cabinet saw.
The saw has 'issues', but only for folks who want to use it beyond the original design intent, so they're not really issues in the real world, except for those who turn their unrealistic expectations into a manufacturing/design/quality issue... Which it isn't. Not really.
I have a TKS80 EBS-Set here. It's perfectly accurate enough for general purpose work. If I want precision table saw performance for off the saw joinery, I would use a cabinet saw or an alternative system.
Bottom line, it's a good saw, for what it was designed and built to do. The fence works fine and you know what, if you can't figure out how to move the fence over another 9, 12, 15, 18, 20, 24mm to overcome a 'need' to position the fence on the joint between the saw and extension table using a piece of ply/mdf/melamine chipboard...or flipping the L fence position to give that offset in about 10 seconds... Well, I'm not really sure what anyone or any manufacturer can do to help you
I'm not trying to be rude, but if you know what you've bought, what it's designed to do and how you're trying to work around that... Do that. Solve the problems you've created for yourself in trying to use something in a way it wasn't intended to be used, and be creative and ask for ideas and help. Just complaining that XYZ is pointless.
I really wish people would be realistic when they look at tools like this. It's has a multi-part top made of aluminium extrusions, same for the frame, the surface can never be as flat as a ground cast iron tablesaw (so stop expecting it to be!), then it has a trunion and motor assembly suspended from that combination of parts which forms the top... Anyone who actually thinks that's going to delivery precision capability is just not thinking critically at all..