I primarily mine ETH because I cant afford to spend more than 2 or 3 hours per week on the whole process. Even if ETH mining is not the most efficient for my AMD rigs, it has been most stable way to just passively earning few coins.
I tend to do the same, it also seems that everytime I try and switch to something else, either the diff increases insanely or the price dumps which in turn ends me up at lower profits then simply running ETH.
I would rather have a stable ~10USD profits per day with my rigs doing crypto, compared to "perhaps" getting more than that.