[random internet advice]

The organization/team made a decision in the past and moved forward. You weren't there. You don't know how buy-in was achieved. You don't have the big organizational picture. Yet to a first approximation, you're telling everyone they are doing it wrong. Changing the structure of modules might make you more productive but it requires everyone to change the way they are doing things and to do so without misunderstanding at best and passive aggressive resistance in the average case and destructive behavior in the worst.

Don't misunderstand me, I've put myself in similar situations in the past...enough that I could run out of fingers to count them and be forced to take off my socks. What I've realized is that on average, I was more wrong in the ways I was wrong than I was right in the ways I was right. Or to put it another way, it's theoretically correct that soft tires will provide better traction than all season tires in a rain storm, but pulling off the road to swap out tires in the middle of a downpour isn't ordinarily a good idea and so loading an extra set of tires into the back seat is typically a waste of time when the goal is driving from Seattle to Boston and then to Miami in February.

Your in a new culture. Be anthropological and observe and learn with minimal intervention. Just because it is different from the cultures you know does not mean it's broken or wrong. Again there is a big picture and the big picture is about people making money and alternative engineering approaches are usually rounding error. To be explicit, the way things were done at your previous employer were the practices of a failing business. That might be a reason to treat those practices as suspect.

Good luck.