The player reaction to the bugged weaponry combined with a step-up in NPC challenge when 2.1 Engineers was launched was overall highly unfavourable, noting that there were some players revelling in the misery of those adversely affected. Frontier reverted the change a week later - likely having seen what the effect had been on player hours.
Agreeing that NPCs should pose more of a challenge in Powerplay is one thing. The question then becomes: how much more, and in which contexts? Noting that half of lpayers are at or below median skill and not all players fly engineered combat ships - so if that half of the player-base is not to be effectively excluded from the content then the contextual level of challenge needs to be set with care.
I agree the bugged weaponry was an issue that needed pulling (and was glad it was, to be clear), but for emphasis I'd like to highlight that the 'adverse affecting' you mention was a change from AI that would go static, and roll on the spot without taking any action (unless they had turrets) vs. a player, to overnight actually dogfighting/using Flight Assist Off, 'wolfpack' tactics and disengaging when they realised they were not going to succeed.
The 'revelling' in misery was aimed at players (from what I saw) who were used to rolling in one of the big 3, all turreted hardpoints, all shield booster utility builds who used to talk big about their PvE 'Eliteness' (which pretty much at that point involved parking in middle of combat zone, set turrets to engage enemy, go static, and make a cup of tea/read a book to make major impact on CGs and BGS (as I we saw it at the time, before the 'one kill, turn in exploit), who tended to turn their nose up at any PvP player as 'a griefer' who couldn't handle anything that wasn't a soft target (these players incidentally were the ones who generally relished the change and the challenge), or those flying unshielded merchants using Solo/PG play suddenly finding they were taking damage who were snapping when their rants on the forums were met with 'Why are you flying an unshielded ship?' from Open mode players.
In my opinion, PP NPCs should present some of the biggest threat (outside of the 'goids) to Players who interact with the PP system, providing encouragement to adjust tactics, encouraging a multi-ship/multi-crew solution to the threat they pose.
This is not a 'gotcha' question by the way, but regarding 'Noting that half of lpayers are at or below median skill not all players fly engineered combat ships', do you take similar umbridge with the Thargoids as a game concept?