I work for a major open source network software company, we support IPv6 natively and in the past 2 years I've been asked about IPv6 by my customers exactly...zero times.
Sonic (beloved Bay Area ISP) got pestered with requests for IPv6, until they finally natively implemented it for their fiber, even though they had 6rd tunnels before.
But granted, Sonic is favored by enthusiasts, so they likely have a higher share of customers caring about such technicalities. And even then the ratio of users actively asking for it may have been tiny.