It's practically in the post then π
I don't want to be an enabler (honest!) but maybe your band mates are right.
Although I too manly play a 4, I wouldn't be without a 5 for those magic moments when a 5er is just so right for the music.
In the past I played a 5 string as my main bass for a couple of years but it wasn't for me.
I have an inexpensive Harley Benton 5er now for said magic moments.