[Arthur Lunn] “I’ve read that it is strongly advised that one avoid a simple viewfinder that simply magnifies the pixels.”
Don’t know where you have read that, a viewfinder is normally on the top of most must have list.
The are some cheaper models that will not let you focus but if you have 20/20 that is not an issue, if you want or need focusing you simple get a model with that ability (with a diopter or spacers).
The other thing for starting focus you have the focus assist with enlarges the image on the lcd 5x or 10x, not available once you are recording but I use it all the time, with that and the viewfinder you can get critical focus fairly easily.