The argument over why there is a 30/10 product, probably because it's a wholesale regulated product as part of the agreement from all LFCs have with CFH.
IIRC, the 30/10 product was upgraded at no cost to 50/10 in all Chorus areas.
And maybe Enable followed suit? But UFF didn't, and UFF 'basic' customers are still on 30/10
Still a lot better than ADSL2 12/1