I really don't give a shit about how real life swords don't make metallic 'shiing' sounds. Though, if you are curious, yes, I've used a blade in real life. Machetes in particular give off a metallic sound when swinging them. Like a metal woosh. Even if that is not indicative of bladed weaponry as a whole in real life, I could honestly care less. Video games, or more particularly JRPGs, tend to have a specific audio aesthetic when it comes to how bladed weapons. Is it realistic? Not really. If the gunblade goes "Wugh wugh" when I swing it, that sounds like a blunt weapon to me when comparing it to the previous original audio.

Take for example two other games that heavily feature sword combat:
https://www.youtube.com/watch?v=FQu3W4qFvCg
https://www.youtube.com/watch?v=hNTFUNzeMVA

Both have a similar audio for their swords akin to the original gunbreaker audio.

So when I say "It sounds like a blunt weapon" I don't mean "LOL IDK WHAT IM TALKING ABOUT B/C CLEARLY SWORDS ARE SUPPOSED TO GO THUMP IRL" I mean more "This weapon sounds heavy and sounds like shit and is not like the previous sound." It's my opinion. You literally cannot tell me my opinion is wrong because opinions are subjective and not objective. If I say "it sounds like a blunt weapon" that is a subjective opinion. You won't convince me otherwise.