Sometimes people try to join long boards together, edge joining, but don't have the skills or tools to do it, so it comes out looking half Azz bad. By emphasizing differences, like with what you have done with the table, accentuating the irregularity with intentional gaps and varying dimensions and such, the results can be much more pleasing than falling short of a goal to make things real perfect tight looking. The naturalness of irregularity is pretty cool, but really not so easy to pull off.