You are a rare, RARE crafter then. Nobody I know who crafts does it for that. It costs so much in time and/or gil that if all you want is repairs or overloading your durability it seems insane.But hey, I don't pay your sub, more power to you. However you still listed many reasons you basically would never need this skill or perk. 100% is a lot of wiggle room and with menders everywhere who ever needs more?
I will admit here too many assumptions were made. I assumed you understood repairs required a catalyst and assumed that this cost will not change if this system is implemented. When you COULD repair someones gear in 1.0 you would get a trade window with slots to put gear to be repaired and a slot to put in a Gil amount because it cost mats even back then (it used to use a component of the crafting, like thread or cotton for cloth items) . I'm also assuming this is how it gets implemented again since this game is still based on those same systems but perhaps only using dark matter for all repairs because going backwards into more item bloat would cause a lot of backlash. Therefore my entire premise is that this is the system to be used: Initiate repair request, player accepts, items to be fixed are dragged to correct slots and "tip" (this will end up being a known value for the mats) entered. Both players hit "agree" and poof. Done. Crafter gets paid for their mats and possibly a little more for the help and everyone is set.
The first example you present is not griefing, and any reasonable crafter would be fine with that request as it would take seconds to complete and benefits everyone. In what way did I imply at all that a polite request would be met with a votekick? AND.. even in that case kicking someone unprepared to do a dungeon, is STILL not griefing. You will not get punished for kicking someone who even politely refuses to do their job (wear level appropriate gear, perform mechanics at a reasonable pace), even if you are able to repair their gear it is not your responsibility to do it since in the example I've now fleshed out you would have to spend items/gil and that is your choice to do so. It will still never be the fault of the crafter.
YES the wording is a big deal, I am surprised you cannot extrapolate my example to mean all negative demands. HOWEVER, even demanding... uh.. "with an angels voice like a sweet princess with the eyes of a welp" which I'm assuming you mean being polite and or using flowery language is still a demand or ultimatum, in which case you can still votekick and have text evidence that they were intending to delay running until services were rendered.