Jay,

I would agree with that. Full power/idle power cycles are very hard
on engines -- and that is what you're doing in a touch & go.

I wonder where you would get a hint of data to support that statement.
Certainly not from flight schools.

Touch & goes aren't necessary to practice after your first 1000 or so
landings, IMHO. If you don't have it down pat by then, a few more
T&Gs isn't gonna help, and the beating your plane takes during the T&G
process is something to be avoided.

No offense, but you're making very bold, sweepingly general statements from
your personal little world view again, a trap you so often like to fall
into. Not everybody gets to fly as often as you do, for various reasons.
Not everybody owns a plane. Those of us with lengthy pauses in their flying
do indeed need to practice touch&gos after a while. Those of us flying
different models need to, too. There's a ton of other reasons why to do
T&Gs. Apart from that, I don't see the "beating" part as a necessary
consequence, either.

--
Thomas Borchert (EDDH)