Why do you think an inkjet print would have no artefacts? It does at the scale of ordinary household inkjet printers and with the high ink deposition and viscosity necessary for a board I'd expect it to have more, and in practice it does.
On the other hand 'silk' screen prints, done properly, show no hint of the screen in the finished print. Find a screen printed tee shirt and try to find any printing artefacts and you won't, barring the odd manufacturing error, and they use much coarser meshes than PCBs. The stencils used provide a continuous edge to the print and if you run the right amount of ink (usually requiring a 'flood pull' with the screen out of contact with the printing surface before you make the actual printing pull) the ink flows to fill in any areas where the screen might block ink from the print.
On longer runs of medium quality boards (certainly down to 8/8mil) screen printing is used to apply the patterned resist before etching, the patterned solder mask after and the final silk screen and if either of the first two had artefacts the board would fail completely