The first elephant in the room here is that regardless of what fabric you use and how well cut and designed the jacket is, it will still have a bloody great upwards-facing hole which your head goes through and in anything resembling heavy rain, water will run down it. Particularly if you don’t have a hood, but even then to an extent.

The other elephant is the D in DWR, as pretty much all durable water repellent treatments turn out to be not very durable at all and once they stop working – usually a matter of hours or less – the outer face of the fabric soaks up water and drastically reduces moisture vapour transfer (aka breathability) from the inside of the garment outwards and you soak in your own sweat.

The two exceptions I’m aware of are Columbia’s OutDry Extreme and Gore’s ShakeDry, which do away with face fabrics altogether and have the proofing later on the outside, hence the gimpy, rubbery appearance of both fabrics. They don’t use a DWR and consequently they don’t wet out.

Oddly enough, manufacturers don’t really want to talk about either, fwiw, wearing a buff around your nexk reduces the problem with the hole for your head, but the relative uselessness of DWR treatments renders a lot of the breathable technology spiel semi-irrelevant ime.

… it will still have a bloody great upwards-facing hole which your head goes through and in anything resembling heavy rain, water will run down it.

If you plan on swimming in it maybe. I’ve been out in all kinds of weather over the years, in various jackets, and I can’t say the hole in the top has been the problem with any of them.

This happens with shoes, but only where there’s lots of standing water and the wheels direct a constant jet of water just above that hole. Generally, even a heavy deluge of rain coming from above isn’t enough to penetrate those parts significantly in my experience.