This is true from the perspective of ‘performance of teams in European competitions in the last 5 years’ but there are other factors that impact the inclusion or exclusion of leagues in statistics. France is a top 5 league in revenue for example, which is a fairly good proxy to measure how many people follow the league and would therefore be interested in hearing stats about it.

I personally would like all stats to include the top 7 leagues but it gets tiring to see people pretend not to understand why Ligue 1 is chosen as the 5th league ahead of Eredivisie or Primeira Liga.