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There is also "optimal" piston/cylinder size so its not wise to build small piston V8 engines because you cannot get so good efficiency small v8 as using with correct size pistons.
Also as people already mentioned more parts mean heavier engine and also more expensive engine. OEM try to cut the manufacturings costs anyway they can. Its cheaper to produce big 4 + cylinder engine without turbo than 3 banger with one (two or even three) turbo (s).
However that 3 cylinder is 20+30% lighter and gives better efficiency so fuel consumption is the last choosing point to downsizing from V8 to smaller engines.
Also that 3 banger breaks down faster so its easier to sell new car or new engine after the warranty is run out when that engine fails. that is not fun for the customer but good business for OEMs if everyone is doing it.
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