1) We are not only talking about doing this content synched, but also about the enjoyment that can still come from unsyched runs. No one of us is saying that a new person shouldnt be able to enjoy this content unsyched
2) "I just want a purpose to this feature, cause right now it doesnt seem to have one other than undersized parties." - highlighted and copied again, because: That and excatly and only that is the purpose of this feature. You want it to have a purpose? It has one. Exactly the one you mention yourself in the very same sentence. That feature was always to be intended to have excatly that purpose: Not needing a full group anymore. I'm sorry that you missunderstood something here and are still not able to understand what it means.
3) You have "FC members", as in "multiple ones" that would like to do this content synched or unsyched? So, why arent they doing it together?
4) "People are not playing this game to it fullest" - as in "People are not enjoying every aspect of the game" shouldnt never equal "lets cut away everything one specific person doesnt enjoy". My hardcore raiding friend doesnt enjoy crafting, so he isnt enjoying or playing the whole game (and a lot of people dont seem to like crafting). Doesnt mean that crafting has to go. People not enjoying challenging content does not mean that it has to be removed for those who who do.
5) People are "struggeling" with this content because they ignore mechanics. Actively ignore them. You can fail TamTara NM unsyched if you ignore the mechanic of killing the imps at the last boss. You can stand there and the boss wont take any damage unless they're dead. TamTara. Second dungeon in the game. And you can fail it, if you dont do mechanics. OP said himself that they ignored a mechanic and failed because of that. If people got through like 15 dungeons or so (and 6 trials) before they unlock coil and had to deal with mechanics everyhwere, I'm sure they can deal with mechanics in Coil aswell now.
6) If a person cant clear content but thousands of other people were able to - whos at fault here? The person or the content?
You need to stop pampering new people you dont even know and pretend you're acting in their best intrest.