Compare the scrolling behaviour of OPs example table, with the scrolling behaviour of Excel or Numbers. With OPs version you get immediately lost in the grid b

Compare the scrolling behaviour of OPs example table, with the scrolling behaviour of Excel or Numbers. With OPs version you get immediately lost in the grid because the headers don't float along with the scrolled view, which makes this best case useless, worst case harmful (e.g. confusing important columns). If you have thousands of columns you're not going to do manual eyeballing of values anyways, you'll lose track because scrolling is not accurate enough, so you might as well represent rows as documents which densely shows the fields/columns and values, and which can then in turn be shown in a vertically scrollable list.