Did anyone seriously see them as a Nature Knight in 1E, though? I ask because I've seen quite a number of 1E Rangers, including two extremely iconic D&D characters, Drizzt and Tanis, and none of them was remotely a "Nature Knight" - rather they were skirmish-y, lighter-armour-wearing types.
Calling the 4E version a "Fighter-type" is pretty odd, imo. They were no more a "Fighter-type" there than any other Striker, and had plenty of Nature-oriented abilities - particularly in their Utilities. As the edition wore on, they gained more nature-magic-y abilities, too (there were quite a lot of types of Ranger by the end of 4E!).
I dunno if I can agree that the Bard has changed as drastically as you claim. It changed drastically from 1E to 2E (but much less so if you look at the Dragon version of the Bard, which seems to be where the 2E one comes from), but every other edition has kept it as a sort of leader-y type who is decent with weapons, wears light/medium armour, casts some wizard spells (gaining some cleric-ish ones in 3E and 4E), and inspires or boosts the party by song, music, or the like.