I have never needed to upgrade my brake pads as I dont do track driving and dont brake last minute. I am an advanced driver with a stage 2+ K03 and have never had an issue stopping on the road at any speed.
I was stage 1 for about 18 months and went straight to stage 2+. I am on oe brakes and dampers with eibach lowering springs. The rest of the car is standard. The car still feels planted on the road plus I have saved myself a lot of money. I am not a big believer in doing x y and z to a car for the road. To push my car as it is beyond its limits you would have to do insane speeds and on a road you cant do that. On a track is a different matter altogether as its a different style of driving. One of the best mods is driver tuition.
....I agree with you 100% about driver tuition and have done courses with Drivetrain (ex Police instructor) and CarLimits - Remap your brain, folks!
However, when there's no traffic about I do love a spirited drive where braking late and hard is great fun. Also, driving hard in the twisties and fast bends is where all the handling mods and Quaife diff come into play nicely.
You don't have to be doing insane speeds to get more from the Mk5 GTI's handling. But of course it's ETTO.
The OEM GTI has brakes and handling which are only designed to meet its stock performance. Once you up the power it's sensible to balance the car with braking and handling mods IMO. And quite apart from that, I'd rather have very strong brakes and not need them than need them and not have them when someone else does something unexpected. I reckon that in the 7 years I have had my car, the AP Racing brakes have saved me several times from other road users doing something stupid.