If the cells in the Pylontech's were the standard block cells I would agree with you (at least the first bit ), but I have seen a tear down video of one and they are pouch cells, with nightmarish very complicated PCBs. But then, they never seem to fail.
Another thing I liked about AlBargey's build is the attention to detail on the equal length cables to the batteries. I have a 20cm difference between two equal battery banks and it makes a small but measurable difference. I keep meaning to lengthen one of them to match, another ToDo list item.