I'm not sure what was meant with the previous comment about "limitations of the host sim" considering that MSFS has some fantastic bridges.
But more importantly, an add-on doesn't necessarily need to focus on bridges. This looks great from what I can see, but it also looks like it'll offer a lot of buildings. A developer needs to keep frame rate in mind and not just beauty. Perhaps they decided to focus on more iconic buildings instead and keep the bridges relatively simple. Otherwise, we find ourselves with stuff that is absolutely beautiful but that drops your frame rate from 50 to 10, as there are some examples out there, without naming names.