Yeah a strain that gets around immunity to other strains is a big deal, even though the vaccine still works it probably pushes back the time until herd immunity by a few months.
And when people call the new strains “vaccine resistant” it’s a bit of a misnomer. Imagine it like this: if you get shot 50 times in the chest, you’re going to die. If you put on a Kevlar vest and get shot 50 times in the chest, you’re still going to die, even if your chest is now “bullet resistant.” It’s the same priciple: the new strain offers a little protection but not nearly enough.
