The rub isi'd rather go for broad applicability, the idea of a ranger, or most any skill based character really, swapping out their 'specialty' on a dime doesn't sit right with me, it's like, oh you spent the best part of your life until now surviving in the mountains studying how to kill giants, but after an afternoon of reading you're just as prepared to traverse the jungle and take down undead but have forgotten everything you knew about mountaineering and giant slaying.
1) What fits the ranger modus operendi in most sources of media
is not
2) What is good in D&D
Its sorta like the Full Martial Grounded Fighter problem.
A realistic grounded fully martial fighter sucks in D&D without magical item requirements.
A realistic orcslayer sucks in D&D without magical item requirements if they face a dragon.
A realistic dragonslayer sucks in D&D without magical item requirements if they face orcs.
A realistic arctic ranger sucks in D&D without magical item requirements if they range the forest
A realistic forest ranger sucks in D&D without magical item requirements if they range the arctic.
So either the ranger is:
1) a minor dragonslayer and a minor orcslayer
Or
2) a slayer who can switch from a major dragonslayer or a major orcslayer
Or
3) a major general slayer who has a tiny bit of dragonslayer and orcslayer
History dictates the community hates anything else

