Well, in 1e at least the deities are close enough and tangible enough to a) deliver 6th and 7th level spells directly to their high-level clerics, and b) give halfway detailed answers when hit with a Commune. I think the same is supposed to be the case in 2e but I'm not sure.
And in at least one major setting (FR - in the 1e-2e-3e versions anyway; haven't got anything newer) the deities* are supposed to be close and tangible enough to manifest in the prime material now and then. I think, but am not sure, the same is in theory true in Greyhawk.
* - or their avatars, pretty much the same as the deity itself only in recognizable physical form
So saying Eberron, which came out in the 3.5 era, is an exception is true in one regard: it's an exception based on comparisons to what went before it and concurrently with it. 4e, and maybe 5e, have since made Eberron look like less of an exception than it was to begin with.