I’m happy enough with a voucher, as I’ll definitely use them like I have for the games i had tickets for before lockdown 1.
If you have a certain type of circumstance, visiting family, friends going for a first time and would prefer a refund, I see no issue in emailing the club and requesting a refund instead of a voucher. I’ve had a few refunds from ticket master for gigs I can’t make due to the new dates not falling right.