Music is subjective, but it is objectively not bad music. You can not like it, but it is well composed and I subjectively remembers several tracks in the game. I can name the harpy battle music, the down by the river song and the bard song from the druid grove as very memorable. (I haven't gotten past Act I yet, but I have heard the house of hope one and I love it as it is very thematic to Raphael as a character).
With regards to party size, this is simply nostalgia speaking. You remember being able to play with six in the older Baldur's Gate games and you are mad you can't do that now. Mods are already available to expand the size if that is what you want. However, the game is balanced around 4 party members. This is actually in keeping with most adventure modules in D&D. Most are balanced for 4 players.
The inventory system has been improved over the years but definitely still needs some work. Specifically being able to manage party members inventory that is not currently active.
The silent protagonist is much preferable for a game like this. The dialogue choices are quite long and it would be weird to read them just to have them said back to you exactly.
Alt does not highlight loanable containers to encourage exploration and the idea of looting everything like the tabletop. I will agree that it can be cumbersome and an option for it just to highlight what actually has things in it would be nice.
