I invest exclusively in ETFs (and I actually manage to avoid individual shares completely).
However, satisfaction is important for a good personal strategy, because long-term satisfaction saves you from constantly brooding and avoids quasi-optimizations (which often tend to turn into pessimizations).
For my personal satisfaction, for example, I need 5 different ETFs for my "World"...whereby the big ones are not plain vanilla a la MSCI World, but ETFs with a customized investment strategy (the $JREG and $GGRG). The same applies to the supplementary EM and small cap ETFs.
I use small units of a World IT ETF and a Nasdaq ETF to deliberately accentuate my portfolio in this respect.
I round off the portfolio with a special ETF with a sector rotation strategy on the S&P 500 (whereby the sector rotation strategy ETF $216361 will also have a permanent share of over a quarter).
I am extremely satisfied with this very individual composition and have so far been able to completely resist buying even a single share - because it would not give me any further advantage...
I haven't been around for long either. I kept thinking back and forth about whether a $VWRL would be enough for me. In principle it is, but I decided against it. I'm now saving 4 etfs because I have the weighting in my own hands. I have the $IWDA, $CSNDX, $EIMI, $CSSX5E, with different percentages of course.