That depends entirely on exactly what Hamilton suggested, doesn't it? If he's suggested some adjustments to their autoclaves, that's very different to suggesting that some extra people are present at post-race debriefs or adding some features to the DIL that Mercedes has and Ferrari doesn't.
If we take your example, say the barista has previously worked for one of the software companies rivals and has just started working at this place. It's not arrogant for him to say "my old employer gave all the employees a free coffee and cake on Friday mornings, it was great because it got all the people from different departments chatting to each other for half an hour".
Mr Barista doesn't need to know what linter the devs are running or what source control system they use to be able to offer a suggestion that is potentially worthwhile.

