No judgement here, airsoft RIFs are like guitars, motorbikes or screwdrivers, you can never have too many...
I'm honestly pretty nonplussed by metal bodies. Yes, it's more realistic, but I'm not looking for realism. For me, practicality is key, and plastic is lighter and cheaper so it wins the day. Just my preference.
My UAR is essentially internally an AK wrapped up in a 25th century casing... or as I like to think of it, it's a Lada underneath a Pelican Dropship. I just fancy an AK as it's something a bit different/foreign to appeal to my inner Commie, and a massive capacity magazine. Plus I've tried a CYMA AK and they are excellent shooters.
Also on the want list are an XR5 and a Deagle of some sort however waiting on UKARA coning through plus depends on whatevers in stock so no rush...