I changed my fixed monthly contributions from the ETF SP500 to this MSCI World index fund, the change is to diversify around the world and not have 100% in 🇺🇸 and on the other hand I have the tax issue of 🇪🇸, with funds you can make transfers from fund to fund without paying taxes, with ETFs you have to go through cash ... So in the long term it is very beneficial to be in funds and not in ETFs.
(my monthly contribution to the fund will be €300).