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Didn't read bucko
I think all the problems you point out aren't unique to one piece, all the classic anime share the same problems with long drawn out plot lines, frequent training montages, flash backs to shoehorn in an explanation for the upcoming plot twist, filler episodes to keep the audience interested while they wait for the new manga to come out.
Modern anime has the opposite problem, they try to make every episode action packed at the cost of character development and story telling. >

The new season of Bleach is what I consider a good combo of action/ storytelling pacing. And im actually digging the training episodes >

Nah the new season of bleach sucks so far.  None of it makes any sense and nothing fits with any of the previous seasons.  It's like a spinoff of bleach set in an alternate timeline where nothing that happened previously matters at all.
Its visually pleasing but the story telling is sub par. >

Wild opinion but i read the manga so idk maybe its different for you >

Well I didn't read the manga but the Bleach anime literally ended with Ichigo losing all his powers and being unable to see hollows or soul reapers anymore and having no way to get back into the soul society. The ending scene has him coming to terms with the fact that he's just a regular guy now as he walks off into the sunset.
They didn't make any attempt to reconcile this with the new season.  They just act like the last few seasons of the original anime never happened. >

Was the fullbringer arc. Not a great arc but it does exist >

Yeah after doing some googling I found out large chunks of the anime don't match up with the manga at all and toward the end the creator was in poor health and the studio was pushing to just finish it so the ending of the original anime isn't really cannon and thats probably why it makes no sense to me having only  watched the anime.
Leaving that aside, I don't think the introduction of squad zero and all this new lore about how zanpakuto work makes any sense in retrospect. And Ichigo being a quincy now is completely out of left field from what I remember about the anime.  
Maybe this makes all sense to manga readers but it feels like they are just ignoring anime fans by not addressing any of the inconsistencies.  Maybe some of the anime filler wasn't cannon but it still happened, its bad writing to just ignore it and go back to the cannon with no explanation to help the anime fans out getting the right track. >

Popular opinion among seasonal anime watchers. >

Okato?  I think you mean Otaku, buddy.  :)
I prefer DBZ personally >

Iam not good in English and iam worse in writing  Japanese word in English 🤣 >

This is the problem with any manga adaptation while the manga is still in serialization. Adapting 15 pages of manga to 22 minutes of anime always ends the animators drawing everything out and wrecking the pace.
Pace works best when a single episode can cover 2 to 3 manga chapters.