Because the new turbo pilot might think - Now that I have a Turbo, instead
of staying down low out of the clouds, or even better, staying home, I know
that if I encounter Ice with my new turbo I can "safely" climb up through
the generally 3000' thick (at the most) layer of icing conditions and be
safe.... In other words, if I encounter Ice, I can climb out of it fast &
strong with a turbo plane, so more pilots decision makings may be a little
more adventurous.

Another reason might be flight planning - I can/want to get there in a short
amount of time & fuel, but I must fly higher to achieve this plan, so I must
go through that small layer of clouds.

alan.