why are the weapons smiths no longer willing to talk to me , or they are missing ?
in novigrad he's gone , there's a armorsmith ,but not for weapons ,
i cant instigate a conversation with the one the one swordsmith i did find .
this game has some of the most bizarre design choices or odd bugs

Interactive map for you.

The blacksmith south of Hierarch square is bugged sometimes. To make him appear, all you do is just run south towards the river and by the time you reach it, the blacksmith appears in his workshop. That is if you visit him during the day of course.

A lot of vendors and crafters only work at certain times of the day. If they are missing, they are probably just somewhere else. The journeyman in Novigrad leaves in the evening, I suspect to eat or go drinking. He comes back for a couple hours, then leaves for the rest of the night, and returns in the morning. If they don't talk to you, try saving and reloading.

I got a similar issue with the merchants of Novigrad. A lot of them refuse to sell their stuff(when chatting with them, their answer like any regular NPC), regardless they are marked in the map like they should sell you something. Btw, that map is awesome :D!

the one guy finally popped in in novigrad , still the vendors and smith that refuse to respond are a bit annoying .
also the map icons are bugged at times ,
all in all they are small issues for such a large game