Are there any consequences in a total failure when glyph hacking as opposed to just hacking normally? Or is a total failure essentially the same as a normal hack?
While Kappei is correct to say that there is no items penalty for failing a glyph back, there is the obvious time penalty - while a normal hack I'd just one tap on the scanner, a glyph hack is long press... wait... see glyphs... wait... trace glyphs. If you're in an even moderately dense portal field, that means you can't hack every portal without stopping walking. If you're not getting any extra items out of the hack, that's going to dramatically slow down your item collection rate per unit time.