I used to like weapons with durability more, but being able to freely play around with all of my weapons in Engage has really changed my opinion.
As for weight, I don't mind them, though I do like weightless weapons just a little bit more. Weight is there to balance some higher rank weapons, I get it, but in practice in make Iron weapons always viable, while Steel weapons suck. I like the sense of progress when seeing my army discarding their Iron weapons to upgrade to Steel, then Silver ones, like in Awakening. Though weightless, no durability Brave weapons might be a little to broken and dwarves most other weapons, but there are many ways to balance them (that does not involve stat debuffing like in Fates)