Why we can not have dungeon-loot system?

Hi,

I think that system like that would make game much more better! In my opinion, long dungeon (for example very big map, or few in row like lab - but much harder) with long (i did not mean "hard" - just not 3sec melting fight) boss fight with lootbox system on the end would be much more rewarding.Boss fighting in mmo games is always most funny and exciting (because of loot promise), but in poe bosses are not rewarding at all - its pretty understandable because maps are short and easy - why we can not change it? Why we can not have boss-loot-box (like atziri of shaper) with types of unique items connected to unique boss? It would make boss hunting much more interesting and rewording, dont U think?

Please help.

I didn't find the right solution from the Internet.

References:

https://www.pathofexile.com/forum/view-thread/2138715

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Thanks