Money isn't an issue LOL you really think it would cost that much money to add matchmaking? They spent even more money already adding guided games which basically is the best kind of matchmaking you could possibly get for a situation like trials or the raid.
Guided games exist to help people who want matchmaking by meeting them in the middle by setting up a situation in which the matchmaking is ALWAYS paired with people who are experienced. If people are simply not using the system and using lfg instead that's the community's choice, and it's not an incorrect or wrong choice it's just their choice..
Regular matchmaking does not exist because including it would imply that anyone and everyone should be able to tackle the raid as soon as they meet the minimum light requirement, it would encourage people to play solo instead of joining Clans and taking on difficult content in a tight-knit team which is substantially more effective. People complain that they didn't have matchmaking of any kind, so they put one in apparently that's not good enough LOL.
Tldr I'd rather than keep matchmaking the way it is and keep the raid semi challenging, then have them dumb down the raid, like they did for all the WoW raids and make them matchmaking access.