Apple later updated the specifications. Originally, it was 5.0. 5.3 was only for the Ultra but later for a reason we don’t know it was replaced with 5.3 for all the latest generation watches.Not sure why there’s such a big misconception here but the regular Series 8 already has Bluetooth 5.3 (check the Apple.com specifications)!
It was a major reason why I upgraded to the regular S8 from my earlier S7.![]()