There could be one potential advantage which is becoming part of their network (although it is possible that this also extends to the co-authors)
When I submitted a paper on editorial manager, I received a barrage of review invitations (at least four), but in another case, as a first author and not a submitting author, albeit in another journal and management system; manuscript central, I have not received any such correspondence.
Well this is all very speculative.
but what I can say definitively, is that when you are the submitting author, you manage everything that deals with the editor and journal. You manage the cover letters, you can also see little things here and there that are missing. Such as your ORCID affiliation for example. More importantly, if you are first author, you might be interested in making sure that things are done correctly! Keywords, disclosures, agreements about whether you want coloured figures or black and white figures. These are all little things that might not be communicated properly. Some might see these things as trivial and might not even ask for your input.
It also helps to become familiar with these systems. They are not a five minute job, especially when you consider the templates and other requirements that will be stated in the journal page and also restated in the online management system. If you are always co-authoring and you also happen to never submit yourself, then you miss out on some of these administrative subtleties.