Because you are seeing positive comments all the time. As soon as anyone says they were less impressed it starts unwanted discussions/arguments re price/taste/versatility and whatever else. And there is only so much time you can give to typing away on a keyboard - all of which would take 2 minutes to discuss verbally.
There have been people who bought them and were less impressed. It’s such a personal thing though.
At one time I’m pretty sure people didn’t think about single dosing at home, they stated with a grinder with a hopper. The last time I talked to what’s-his-name at North Star they were selling the Sette (a grinder c£300) alongside the LMLM. They hadn’t even heard about the Niche (when it was already in circulation).
I am not sure about this but as you get 'into' it you start to think nothing less than this (expensive/pricey) grinder and that (ditto) machine are the way to go. I am fairly sure we didn’t all start out with £2k set-ups though and while in the long run it may be prudent to spend as much as that to save money changing in future it seems ridiculous. I didn’t buy a car 10 years ago thinking 'that’s it for life'!
My friend loves her coffee. It’s from Nespresso pods! If she wanted to go up a level she would think it was bonkers if I suggested spending a couple of grand, as though that was what you’d need to d to produce a half decent cup of coffee. She would probably be happy with a mid range Sage.
Why don’t we see the Eureka mid priced grinders mentioned these days, or the Compak (at one time Reiss at Londo was happy to suggest a mid range Compak, if I remember correctly).
Speaking for myself (and I don’t give a dot if people disagree with my opinion) I didn’t rate the Niche. Before you ask, apart from other reasons (and don’t ask me to start listing them off) the taste in the cup was lacking anything I’d produced with my E8 (a grinder which you could possibly find for not much more than the N), or the HG-1 (yes, more expensive). Was it better than a Sette? A Mignon? I don’t know.
I think I am trying to say there ARE other grinders out there you may wish to consider. I don’t think one person can tell you what to buy, we all prefer the grinder/s we own probably.