Why is the Silmarillion map incomplete?

[Gwaihir the Windlord]

Oh, thank You so much Gwaihir! Your maps helped a lot!

Well, actually they weren't mine you know. [img]smilies/smile.gif[/img] I found them on Google; yes, they are quite good.

Findorfin, Angband in the days of Utumno was in fact more than a 'watchtower'. It was an outpost. Utumno would have been significantly bigger, of course, but not neccessarily that much bigger than Angband was in the Beleriand wars; Angband would itself, having been now made the primary stronghold of Melkor instead of an outlier, have presumably grown in its rebuilding.