Most if not all modern SSDs don't need this sort of massaging anymore.
(Having said that, I still have all browser caches (and much besides) on
a RAM disk.)
This might sound silly but for me it's a matter of principle, I
believe in frugality for it's own sake, it cultivates the 'right'
mindset. But from what I understand these SSDs are very good at
reallocating cells that have reached their write limits, so a nearly
empty disk -- everything I have is under 30G and the disk is 240G --
gives lots of room for that kind of thing. smartctl reports the
disk has 92% of its life left. I guess with solid state they can be
quite sure of that number, vs. the rather harder to predict life of
mechanical parts.