Some Thaumcraft Recipes require more vis than one chunk can handle.
Modded recipes require even more:

It would be cool if i could upgrade Arcane Crafter with Workbench Charger , so very each recipe of modpack could be automateable

Ugh, ok.

I can't show example right now, but even some vanilla TC sometimes asking for lot of vis.

Nah, Ive played with Thaumic Additons and getting 1500 aura was the easiest thing in it. Find a good group of chunks, use vis regenerators if available, ans dont forget about vis discounting items - in vanilla TC you can get 47% economy at max.

Yes, you cant automate this, but ugh, mithminite smeltery is not something you will have a lot of