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Klite ones do!
But flashing is not so great, yes it draws attention, but it’s so much harder to see where the bike actually is.
Depth perception on a solid light is infinitely easier.
sbbohr-
I’m sure you’ll agree it’s wise to run two rear lights. Drivers can have a go at judging distance and speed by triangulation as they close-in. If you’re running two lights it makes sense to have one that can flash. As you say - a flashing light draws attention and there are definitely times (riding solo in heavy traffic in dull winter daylight) when that’s useful. Battery rear lights are better for this job. Now you have a battery rear light ... and ... (as I said on the previous page) charging two small lights is not twice the issue of charging one.
tl:dr Dynamo rear lights are nice: a sensible 2nd, constant light. But I can take them or leave them.
miro_o
And dynamo rear lights don't flash.