Guild Wars 2

With so much hassle involved in crafting or buying a legendary weapon I’m amazed it has so little customization.

Because, while it does make sense to adjust the stats, it makes no sense at all to disallow changing of sigils and such. I’m not saying all upgrades ought to be unlocked right away, but for example, applying a sigil to a legendary weapon would unlock it, so that you could swap them quickly later on.

Right now I can not see the point of changing the stats alone, because builds that utilise different stats also utilise different runes.
The only advantage the legendaries now have over ascended stuff is that whenever new stat combo comes out, whis is very frequent, and it actually is a useful one, then you can swap it.
Or you could craft an ascended weapon for a fraction of a legendary, because no matter what you’re going to need as many weapon sets as there are runes that you desire.