Is the BYD Seagull's real world range a deal breaker?

With a claimed range of 405km, the BYD Seagull has been marketed, but many owners are reporting much lower real world ranges. The disparity has evoked discussions amongst BYD's practicality of marketing the car and the transparency of BYD's marketing. Some users are saying they are barely getting 250 290 km on a full charge, a drop considerably from the advertised figure. The resulting discussions have revolved primarily on whether or not CLTC range estimates are reliable and if there is any faith that consumers should put into these numbers when making purchasing decisions. The range issue also calls into question the Seagull's ability to serve on longer trips and, more broadly, the Seagull's value proposition for those who bought into the promise of long range in an affordable EV package.