With such an early Easter this year, and Easter being the busiest time for the sellers, the garden centres are going to have a field day selling their tender plants to punters, who put them out, they then get hit with frost and die, Punter buys a second lot, puts them out, gets hit ... ££££££££££££
The garden centres DO put up signs saying "NOT HARDY", but you normally have to look for them. This is so, when the punter returns and complains, the can say ... "didn't you read the sign that's in the corner, behind the packing boxes, underneath the counter?"
As for Fuchsias, even the hardy type are not truly hardy unless they have been in the ground for 8-10 weeks before the first Autumn frost. This is to a) get their roots deep down where the frost won't get to, and b) slowly get used to the colder weather.
Even then, their first winter can be risky. But once/if they've survived that, they should go on for many years.