An automatic transmission has a lot of parts, but why throw that in, it’s apples and watermelons. The turbine will need gearing too.
Okay, no automatic transmission.
But a turbine is a relatively simple machine compared to a reciprocating piston engine. Oil splashing around in a pan, and pumped to the top. A water jacket and radiator. Valves that require precise timing with expensive cams or more expensive computer controlled lifters. Precise fuel and air metering. Pistons and rings beating themselves to death at the end of a fly wheel. The whole thing threatening to stop working if one part fails. A real Rube Goldberg contraption that only works because of tinking by thousands of geniuses over 100 years.
How many machines do you need to make the parts for one turbine? Now think of how many different machines you need for every screw, nut, hose, shaft, gear, pump, spark plug, etc for an ICE.
In addition, a gasoline engine needs rebuild at about 3000 hours when ran at peak effiency and a diesel will need a rebuild at 10,000 hours. A turbine is good for what 50-100k hours?