I don't really care about what those streamers do. Because those aren't good representative of the general "NORMAL" gamers.
Just let the top 1% zoom zoom speed meta, do what they want and enjoy about it.
I personally hate to play at that kind of pace. In fact when I playing my last Ranger character, I purposefully find a boot with no movespeed... >140% movespeed is just FEELS LIKE GLIDING ON ICE. 
Take it slow, not everyone needs to play at those crazy zoom zoom speed. This isn't a competitive game.

The trading currently is fine, I don't see why we need to change it.
Auction house or automated trading will only makes the game even more speed meta.
Maybe just implement a browser in-game, click whisper and directly input to chat. QOL like those are fine.

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I hate "auction house" totally.
Very little game do trading correctly, most of them are annoying as hell, terrible UI, bad navigation, shit tax, etc.

Black Desert Online : they revamped their auction house to be MUCH better, but still the stupid system determined price range and high tax ruined it all. Want to sell a rock for 1,000,000,000? You can't do that.
I understand why they want to do it that way - they fear the economy go out to hell when placed into players' hand - hyper inflation overtime etc.
But at the same time, taking away players' control makes the trading incredibly SHIT. // Also no player-to-player barter for all items, limited to potion & consumable only.

Eve Online : incredible auction system. This should be the role model for other MMO.
Player decide the price, tax, long posting duration up to several weeks ~ months, easy bulk trading, integrate well with the crafting system to easily acquire material back and forth,
option to buy out directly instead of bidding, can be accessed anywhere you go...

Atlantica Online : not auction house, but a "Market" system - same good trading system like Eve Online. Except there is no duration and bidding because it is not an "auction" house, but an open market.
Additional plus point of the market system in AO is it's automated price reduction overtime feature.
Your item price will automatically be reduced everyday, this is a great feature to counteract people who undercut you, ensuring your items have good chance of selling overtime, even if you didn't login for long time.

Guild Wars 2 : haven't played this for a long time but I remember their auction system is also as good as Eve.
Except the LAGGGGGGGG because the in-game system is almost like a webpage. Dunno if they improved it now or not.

All other MMO / Online games : terrible interface, short item posting duration, high tax, no option to bulk purchase, limited registration spot often gated behind pay wall,
had to stand infront of fixed NPC to access it, terrible item categorization, no search function, didn't link to the crafting system making buying material a chore, etc etc

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POE's trading mechanism, while is slow - but is very well suited for this game, because the VAST amount of item mods, where every items have different mods & value range.
This demand for very extensive search function, not something you would normally be able to cramp into an in-game auction house, at least not the UI design like other games.

GGG has been mentioning many times the whole point of current trading system is to - slow down the game.
If automated trading (auction house) is implemented, no doubt the rich will get even richer - people can just "farm" the auction house all day sniping off items quickly.
This is a real problem for many other online games actually... Trying to buy some rare items? Good luck.

Remember POE's current trading system have one important factor - you can't buy the item if the player is OFFLINE.
This is very important to slow down the game, giving everyone chances.

If any-sort of automation that is "acceptable", probably a "trading NPC" in hideout.
For example: "hei Zanoob, here's my shit I want to sell, SMS me when someone want to buy something, I'll tell you to proceed or not".
No need to quit what you doing and just hit a button to confirm the trade. No portalling out means no issue with lab, delve, zana 1 portal mission, die too much last portal remain, etc etc.