If your fine with the ingestion causing less MPG and less power, as well as the intake valve coking which is a gradual degradation of the engines efficiancy.
And you are correct that most cans are no more than a "tin can", but the few that do have a robust inner design are the ones that work.
If you let this accumulate in the intercooler, that is the cause of most hydrolock catastrophic failures people experience. I think your just looking at this from the water ingestion in cold weather and not the overall effects on the engine. So it is all in if your investment in the truck is worth a few hundred to protect and get the most out of, or if your comfortable as it is. If the later that's fine as well since no one should make you do what you don't want to your vehicle. This is only for those that want to avoid the issues and do what they can to extend life and enjoy it the most.
Here is what you get with the RX system:
Internally it has a complex series of chambers, each with a purpose, and at just under 1 qt, unlike most that are 2 oz's or less, there is some leeway on how long you can go before emptying. In cold temps below 45*F though it is critical to empty weekly and that is why this does not fit into what most owners will accept. Most want to put gas in and nothing else so that understandable....your not alone.
And the cleanside separator:
Now if you were buying one like this:
or this:
Then it is no different than a tin can with a couple fittings in it.
So it is a personal choice, and you make valid points.