Seriously?
May i suggest you educate yourself by googling BOEING (not cessna) 'the ice crystal weather,threat to engines'
Then come back here
I don't know if you are aware - but the engine anti-ice on a jet engine only de-ices the COWL
Its main function is not to deice but anti ice the cowl,but you know that.
Or maybe you are right,sorry i missed the fcom note:'operate the EAI at temp below --40c during descent in case your old fart of a captain forgets to switch it ON in due course'