Our fundamentals are only as good as our depth of understanding of each ‘fundamental.’
Such understanding requires deliberate focus on detail, requiring more out of us attention-wise than any other facet of training. So much so in fact, that we need to be at least moderately settled internally to even attempt such work.
So, the idea today is continued study of a fundamental (upa/trap and roll escape from Mount for example) long, long after everyone else has moved onto more ‘exciting’ subjects is the highest form of celebrating the art of Jiu-Jitsu.
Because it requires way more effort and concentration than chasing every new position appearing on the radar in hopes of ‘catching’ training partners/fellow competitors with something unfamiliar.
To conclude, know that smart, focused work isn’t easy, otherwise everyone you grapple would have killer fundamentals that make you feel like you don’t know Jiu-Jitsu. =)
Finally, intention builds depth, while scattered study leaves holes people generally to make up for with speed and strength.