If you were a Civvy that would be believable.
However, I'm interested by the statement " if you can fix a bike, you can fix a car". Last time I checked Arnold Clark where overwhelmed with 12 year old mechanics because they were proficient at spraying the chain of there BMX with WD40.
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As a Clanky, I'd agree with the bike/car observation, it's just a basic process. Few of us nowadays start ripping car engines to bits & machining, polishing, adjusting & refurbishing the gubbins, we just unbolt one lump & swap it for another.
A good engineer will aim to prevent 'things' from failing in the first place through understanding the detail of and the science behind the kit. Okay, the master race, failing to understand its limits or heed the advice of the engineer, may break it anyway.