i guess comparing the tyres with the piston is a analogy, he said it's not feasible to use full slick tyres on daily road use, same like the forged piston in his case, its not feasible for "long term daily use".
no harm using forge piston in ur engine if u can afford to buy the piston mar.
wont harm the engine also. but forge piston is sure expensive than normal piston. maybe the mech means it is not worth to put a forge piston in ur engine for daily drive.
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