Nothing I said implies scripting; if you think it does, you probably need a better DM.
OHKs and SoDs do not, in my opinion, inherently add or detract from the potential 'difficulty' of the game situation. Other things that are more fair and respectful to player input do that. Again, if you think difficulty of a challenge needs to be modulated by the presence of OHKs and SODs, then you desperately need a better DM.
The game should be fair to the players; it absolutely should. Players should have fair options and fair tools for dealing with the challenges that are set before them. This does not mean it will not be a deadly and dangerous situation. This does not remove or negate the possibility and danger of character death, and should not do so. If you think you need to insert OHKs and SoDs to maintain the danger and possibility of character death, then again, your DM is failing you.
Soft.