I would say most of it is semantics - what you describe as a wall of sound is a porridge to me. I am trying to give it negative quality connotation by describing it as a porridge ;-) [on top of it just being completely boring, as "bringing nothing interesting, nothing intellectually or emotionally stimulating, and also nothing that you could not hear done 10x better elsewhere". The songs you mentioned - this is just bad music, full of clichés and zero artistic value. Yes I can differentiate the instruments etc - but it does not make me
enjoy the music more on better gear.
Let's get to the other extreme - take something that is perfect [in broader sense] - Bach and his Mass in B Minor [
https://shop.monteverdi.co.uk/product/bach-mass-in-b-minor/] I think you can find it also on streaming. and exquisitely recorded. Some say this is the pinnacle of Western culture [it is interesting thing to discuss, as this specific piece has funny background story].
Opening track - Kyrie Eleison and its vocal instrumentation [Bass - Tenor - Alto and 2xSoprano Choir sections] - if you play it loudly on any system - you know straight from the bat if that setup is good or not. And better the system then the music get exponentially more impressive. You do not get this reward with today's compressed music.
[BTW there are 2 Blu Rays out there, recorded in the very church where Bach was performing, well worth the purchase both of them, if you are into MCH music]. On the other hand this specific piece is quite forgiving, as it is inherently beautiful. But let's try some Stravinsky or Mussorgsky Pictures at an Exhibition as a torture test of a quality of the system, or I recommend to blast this one loudly, and you will know after couple of minutes, whether you have any problem in treble range.
Do not get me wrong - I also do like lot of different music genres - e.g. I think Dimmu Borgir and their early stuff is pretty good [to salute your home country] and I spent very nice evening lately listening to a-ha's Summer Solstice unplugged live version. My latest live events [and I go to live music quite often range from Adele, Nick Cave [just wow], David Gilmour [that was f...ing something in Circo Massimo in Rome] to Phillipe Jaroussky and his interpretation of early French court music. [look for Pasacaille de la Folie]
@Axo1989 - I am not ignoring you ;-) , I just think that hype around Charli xcx is more of byproduct of current culture wars, than anything having to do with good music or having any sonic qualities. I have read really glowing review of this album, sa I have given it a try, but I could not find anything that would resonate with me. I like Bille Eilish more.
And without trying to offend anybody - if somebody says Kylie Minogue is "sonically excellent", then the most polite thing I can do is I pretend that I have never heard it. Or maybe we live in times, where standards are so low, that everybody clears the bar. We live in the age of participation trophies.
Time to walk the dogs. Ciao.