Obviously if the clubs with more resources dIt does matter because it is the balance of power, especially if it is because of extremely rich people or because those who are top clubs do things wrong.
o things well it is more difficult for there to be a change of
Nope. Not true. Liverpool have been one of the two dominant teams in recent years without oil state funding.
Anyway, it doesn’t matter why the balance of power shifts. The point is that it shifts. Which hasn’t happened in Spain for decades.
It does matter because it is the balance of power, especially if it is because of extremely rich people or because those who are top clubs do things bad.
It is difficult for there to be a change of power if Barcelona has players like Piqué, Puyol, Alba, Busquets, Xavi, Iniesta, Messi from the academy and above that you sign people like Alves, Neymar, Suárez, Rakitic, etoo, Ronaldinho and a few others.
Also with R.Madrid and signings such as Ramos, Marcelo, CR, Modric, Kross..
In addition, a change in dominance does not mean that a league is better, see the year that Leicester won for example.