This is very true.
I had a Breville for a while that was really neat... but didn't grind anywhere near fine enough for Espresso, even though it was advertised for that. Once I started getting for educated about Grinders, I quickly found the "Step-Up" point for a good quality Espresso Grinder at about $300.
Of which, I am on my second Lelit "Fred" mini grinder in 14 years, with my current one being 4 years old.
An interesting conversation I had, not too long ago, with a guy at 1st Line Equipment indicates that even those machines are of mediocre quality and don't necessarily equate to what he considers a "great" Grinder until you are spending >$800.
I will say, the Lelit Fred has served me well. There are aspects of it I wish they would change, but for simplicity of use and size... it has been a wonderful change in my own household experience. Doserless and Stepless MicroMetric adjustments are the key thing for me. I also Single Dose rather than fill the Hopper and store beans in there.
Arguably the worst aspects for me are the Chute which is just a poor design, but not a deal breaker. I wish it came out a little further from the machine and wasn't so squared off. I am also not a fan of the Fork for resting the PortaFilter and really dislike their Button for activating the machine.
To this last point, I prefer to manually press the Button and I rotate the Portafilter under the Chute for proper Grind Distribution. The "engineered concept" they seem to have is for the user to just mash the portafilter against that Button and hold it there while a gopher-mound of grinds just piles up.
But for $300 vs >$800, I have a very good Conical Burr Grinder that performs well and gives me a high quality grind for my Espresso habit.