When rides are designed as themed experiences it's important to maintain the theming as well as the ride hardware itself. The original vision for Valhalla was to create the world's most spectacular dark ride, something which is achieved through fine-tuning every tiny detail down to a tee whilst keeping on top of maintaining the bigger style effects. I don't pretend to have a clue how to maintain a dark ride (it isn't my job!) but from the eyes of a customer, I do know it isn't achieved through poorly thought out "that'll do" bodges such as this.
Valhalla was designed with the shields for a reason, it's a Viking themed ride and the boats are supposed to resemble Viking longboats. Take the shields away and you've got bathtubs with very elaborate taps. The foundation of the ride’s theme and the journey you're taking in a longboat is lost. I'd suggest that whilst it doesn't affect the enjoyment on-ride, the experience on a theatrical ride such as Valhalla should start the moment you approach the ride and join the queue, not when you board. One piece of theming removed isn't the end of the world, but take away too many elements and you're left with a spoiled experience.
Valhalla has lost a huge amount of its original features (without replacement) and the original spirit and atmosphere of the ride is lost as a result. It's little more than a log flume in the dark these days.
Also, in terms of the average visitor (aka not enthusiasts) I fully understand they won’t be pointing out every small detail that’s missing, but everything combined makes the difference between “wow, that was incredible” and “meh, that was fun I guess.” Surely BPB want people coming off their world-beating dark ride saying the former?