I have a bunch of the "inexpensive" fluorescent under-cabinet lights
in my kitchen. The typical $10 big box store ones. Recently, one of
the tubes burned out, so I bought replacement, a regular old F8T5WW.
The other tubes all do the 3 second flicker before they turn on, but
this new tube snaps right on at full brightness.

Did I just get lucky, or are new tubes like that now? Is there a
different type that I didn't notice on the shelf? For the few $ it
will cost, I'd replace the other 5 to match if I thought they would
all do the same.