Tons of SMEs are world leaders in their domain, you just never heard of them because they produce giant ship propellers, fire hose couplings, surgical instruments, whatnot, not exactly things people not using them ever think about. And of course you don’t have to be a hidden champion to be a SME that owns their market, say, Herrenknecht. Who would be unknown if tunnel boring wasn’t so cool and impactful that there’s tons of documentaries about them doing it.