Well maybe you youself are too new to recognize some of the appeals ;)
One large advantage with silverblue is, that the whole composition of the OS does not take place on the target machine. That means that all the issues that could arise will not take place on the target machine, and can be dealt with beforehand. In the simple case this could mean just enjoying vanilla silverblue without having to think about possibly borking the machine. In an advanced usecase this could mean for example building the os images in a GitLab CI/CD pipeline (with well working tooling that exists already for docker etc), then having automatic tests in the pipeline ensure that everything important works as expected. And only if the tests pass, the image will be added to the repositorie's image registry, where the target machines will fetch it from automatically and rebase to it.
Schwalbe Pick-up? Es ist größenabhängig, aber z.B. unser Lastenrad hat hinten 27.5" für 170Kg und vorne 20" für 128Kg, bei einem Fahrradgewicht von 50Kg + Fahrer max. 100Kg + Zuladung max. 60Kg = 210Kg.