I can kinda roll with your first suggestion, but for your second, though it makes sense when considering simply the text you posted, thinking of "what even is a window statement", your all rows, or the origin ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING, is essentially the antithesis of what a window statement tries to achieve, that all-inclusive of a window is principally just a full JOIN.

So while your text is shorter, there is nearly never a reason to use it if your intent is to use window queries.

I'm very willing to be corrected though, even eager to see a reasonable example or use-case. If you can show me a query with a window statement like that which produces useful results that cannot be produced by a normal query, perhaps with a sub-query or JOIN, then I would certainly concede you have a point.