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in reference to the rando bag stuff, that's totally correct. standard style rando bags (I made a couple for dudes on here a little while ago) do have weatherproofing isssues due to the closure.
me personally, I've only ever made rando bags with floating liners so water getting through the seams is nearly impossible. I use a 4oz PU liner (simliar weight to 420d pack cloth) with has a 2500HH, rather than a truck tarp (most of the time). Theres no exposed part of the main compartment where the needle has gone from the outside to the inside of the bag.
as for the wet getting in through the top, I've done my best to solve that by making a kind of hybrid fold down closure. in this instance its 100x better than a traditional rando bag closure but it's slightly heavier due to the extra fabric. Chaks new bag is made in this way aswell as the smaller klickfix ones.
I'd guess that'd be water coming through the seams rather than saturating the outer and liner (which I assume was your standard waterproof tarp...). It looks like they've replaced the liners with xpac now, should make things a bit lighter but if any water does get in, it won't drain.