Feel like we are talking about 3 different things.
1. Bloom
2. Overly bright systems
3. Overly detailed
IMHO, they are totally separate, but can also be part of the same issue. My vintage system sounded great to me, my TT was the standout performer, much better overall sound over streaming or radio. Was impressed with my system.
Then I did a full rebuild on my speaker XO. This was almost a night and day difference. Top to bottom, everything was better. Much more bass, more mid, more high. Everything was cleaner, crisp, more detail.
After letting everything break in, started to notice more surface noise on certain records, some didn't sound as good, but others sounded so much better. streaming was much better, started to turn down both my bass and treble when streaming.
After a bit, did a full recap on my pre-amp and amp, along with replacing a ton of ut of spec parts.
Just like the speakers, while it still had the same sonic signature as before, everything was better. So much more detail, much deeper bigger bass, highs were fatiguing. Good recordings sounded so good! But bad ones were now unlistenable. Some of my old blues records sounded like poo. Now streaming is king, with so much detail that just was not there before. Tone controls are set to +2 bass, and 0 or -1 on treble. Installed a L-pad on my tweeters.
Went through all 3 of these things over about 3 months. Some of it was for the good but some was for the bad. While good recordings sound so much better, with all this added detail, much lower noise floor, so much soundstage, clarity. Lesser recordings are just not listenable anymore. My old setup masked so much, now it just passes everything, the good with the bad.
My $.02
More detail is a two sided problem. It will bring out all the good of the source material, but will also now overly highlight all the bad in any recording.
Overly bright systems will just give you listening fatigue. You will miss most of the lower and midrange due to it. Weirdly, after installing my l-pads, there was more bass. Think it was due to the tweeters overpowering the bass, that was there, it was hiding behind all the highs.
Bloom, not sure I totally understand it. I get the "ripple" after hitting a note, but think that is also decay? Never really paid much attention to it, but I do know, piano, and acoustic guitar sound amazing on my system. When there is a quite part of the music, then it hammer in, I've jumped out of my seat a few times.