Did this rear brake recall a few days ago - was officially published December 2020 in EU, but I never received an email or plain old letter about it... I just checked on Triumph Website with my VIN after having read this forum.
Rear brake was a bit soft indeed, but this has never been an issue - I only rely on the rear brake pedal to trigger the stop lights when using engine brake, or better handle the bike at slow speed, and it has been working well enough for this.
Dealer's head of mechanics told they did this recall several times, by following a 30min specific Triumph procedure.
Point is, after this recall done, rear brake is stiffer and more efficient for same pressure... we'll see in some hundreds Km.
Anyway, in EU with MUST do such recalls for the manufacturer warranty and insurances to work without surprises, and for the vehicle to comply with regulations.