Both 1e & 4e allow for damage that is not represented by hit points.
1e does not allow for major damage that is not represented by hit points, except in the specific case that a character brought to 0 needs bed rest (or major healing magic) to recover. When hit points are fully recovered, the wound is still there -- it has a very real game effect.
In 4e, you could say that this is (to an extent) reversed. If you want, you could claim that when hit points are fully recovered, the wound is still there -- it just has no effect.
If this doesn't seem like a shift to you (shrug) I very much doubt that anything could convince you otherwise.
You can't convince me that this particular shift happened in 4E, because 3E doesn't require bed rest for that "major" damage either.
You'll also have difficulty convincing me that this shift has much to do (directly) with hp, because, as you note, the hp can be recovered well before the "major" damage, which has to be tracked and recovered from separately (and anyone attempting to kill you still presumably has to whittle away your HP to do so, even though you barely have the strength to crawl).
It's a system tangential to HP, designed specifically to allow a character to not-die when hp run out. 4E has a markedly different not-die mechanic,
but the hp themselves are all still the same.
The actual, real, radical paradigm shifts in 4E hp are linked to the concept of healing surges:
1) There's a cap on the number of times per day a character can be healed...
1a) ...except for certain rare effects (mostly Cleric daily powers) can bypass this limit.
2) Healing is proportional to the maximum potential of the character being restored...
2a) ...except for healing potions which heal a fixed number independent of a character's potential (making them a sort of wildcard)
If I learned one thing from my Sense of Wonder threads re: 3e, it is that the same folks who said "No way, no how does what you're saying make sense" are the biggest proponents of "We needed 4e to fix the problems that didn't exist no way, no how when 3e was the big thing" now. Of course, those people are also the first to deny that they shifted their perspective.
I've seen plenty of "When 3E came out I thought [X] was awesome, but I've changed my mind". I've started to see some of that for 4E as well. This says little about the nature of the systems, and some about the individuals involved.
So it's hard to see who you're referring to when you tell me that some people who said X now say Y and deny saying X. It's also hard to tell how that relates to the current conversation.
(Again with the maybe these little jabs in your post are being counterproductive).