I'm mostly sure Everburning Blade is one of the most beloved weapon in the game
For people who purposefully avoid dipping ...
Probably, almost certainly.

For everyone else, who dont have any use for Bonus Action in first round of combat (so ... Fighters, or Paladins that save spellslots, not sure if anyone else) ... its just regular 2H Sword with litteraly no benefit.

And it cant be poisoned ... quite anoying when you are trying to kill Tieflings.

And it cant be sheated ... wich may loot a bit more realistic at first glance, until you realize that your character is holding it by its burning blade.

About staff of Crones only LUCK will define if the positive effects worth the negative one...
Eh ... what?
Are we talking about the same
Staff of Crones?
The staff that acts just like any other regular Quarterstaff with no effect at all ...
Except it allows you to infinitely use Ray of Sickness ... but when you do, you receive 1d4 Posion damage every-single-cast ... ?
Where is that luck? O_o
I honestly thought this would be perfect item to your liking, it just unlocks you a spell ... and its drawback works every time ... there is no if, no condition, no forced playstyle, no ... nothing you are complaining about with other items. :-/
---
But say the lightning glaive (chance to stun the user), how about a small side quest where we can learn how to remove the negative effect.
I certainly hope we dont get such thing ...
Bcs then it would become straight forward best meele weapon in game! Or at least among those we allready know.
I mean just look:
https://baldursgate3.wiki.fextralife.com/Light+of+CreationIts +1 weapon ...
It gives 1d10 Slashing + 1d6 Lightning
And it have extra reach (as all Halberds do)!
Yes, it can stun you ...
Wich only means ending your turn permaturely, bcs that stun dissapears in next round ... sure it can ruin your extra attack, or bonus action attack ... not sure how it works with Smites.
IMHO ... since attacking is last thing i do in combat, its no biggy.
If you compare this with any other +1 Two-Handed weapon (meaning either 1d12, or 2d6), since this gives its own elemental damage AND still can be dipped, posioned or all other stuff ...
How is any Two-Handed weapon better?
Hint: Its not. 
This Halberd can give 3-17 dmg ... Axes gives 2-13 ... Swords and Mauls gives 3-13 ... and they still dont have extra reach ... Glaives have extra reach, but they give only 2-11 dmg.
What would be the reason to use anything else than this weapon, if there would be no risk of stun?
Hint: There is none. 
Sure, some people could teoreticly still use 50% HP Weapons, since they technically seem better ...
Except still nope, since they only add 1d4 and as far as i know none of them is +1, so even in maximum potential you still have less damage, minus extra reach AND minus half of your health.

No, im sorry ... the stun is needed there, so everthing else even have a chance to copete.

About the staff of crones I suspect they have (or had) plans to change how it works.
Well, i certainly hope they fix it so Poisoner's Robe dont incerase your self-inflicted damage ...
Seems really weird that anyone would use his own artefact power to hurt themselves. xD
---
weapons and armor unique and imaginative effects seem pretty wasted to when they are overshadowed by aforementioned +1 weapons
The fun part is that they arent overshadowed at all ...
People who are very vocal about items just like them more bcs they are simplier, or closer to their own taste.
See Maximuuus up there in first coment ... he seems to be sure that many people concider regular Two-Handed Sword that is permanently diped to be one of best items.
(
Yes, i know he said "most beloved".)
This isnt matter of that Sword power ... so, it dont really overshadow anything.
(
Yes, i know you are talking about "+1" wich this one isnt ... the point is still same.)
It only may seem like theese "boring" powers as Everburning, or +1 are overshadowing other magical weapons ...
Bcs most people that are vocal about it around here simply dislike something in this game, since it dont fit their taste ... and logical acting ones of them therefore refuses to use it.

(
And it dont really matter if its dipping, 50%hp, Lightning Charge, Momentum, or something entirely different.)