Mmynameistaken

HP, Lenovo, and Dell's business series are built decently, however, you always run the risk of receiving a lemon if you don't manufacturer the system yourself. That's where I will agree that the support you receive after sales can very greatly depending on the warranty/support you purchase, along with the support agent you talk to. (This is why it pays to know what support avenue works best for each company - for example, Dell's phone support is so-so, but their social media contact methods are top-notch.)
 
Any system (hardware or software) you don't manufacturer yourself should be assumed to contain spyware - this is not specific to Lenovo. Why? Because unless you developed the silicon & software yourself (or at the very least have access to analyze the source code), you have no guarantee to know if the code your device is running isn't doing anything unwanted.
 
For servers & desktops, I don't have any specific recommendations because there are far too many manufacturers & methods to buy or build a system that works best for each person's individual needs. For laptops though, I cannot recommend ASUS, Acer/Gateway, MSI, Gigabyte, etc. as they don't publish service manuals for their machines like HP, Lenovo, and Dell do, making repairs or general maintenance a game of roulette as to whether you'll break your system taking it apart.

Anti-glare reduces contrast and black levels. This has a perceptual negative impact on colors aswell. It can also ,depending on the type of layer used, add a 'gain' to the image
 
Glossy, no anti glare allows for more contrast, deeper blacks. And in some cases ofc no 'gain'. but you have to work around reflections.
 
 
I use a 42" Plasma, beyond the obvious superiority to LCD, the screen itself has no anti-glare, its glass. Simple solution to reflections, position ur setup so that there is no light source behind you and perhaps also do what iv done and ether paint the wall directly behind u black or hang a black fabric on the wall.

Non-anti glare (glossy):
Pros:
- Looks sharper & more premium IMO
 
Cons:
- Shows fingerprints and smudges much easier
- Glare of lights and sunlight, would be frustrating in an office or school environment
- Forced to look at yourself and contemplate why you are wasting your life away during loading screens for games and videos.

a matte display has more "fuzzy" pixels iirc.
a shiny display will be sharper (a 4K matte will still be sharper than a QHD shiny one tho)

Nah, performance different  between laptop 2060 vs laptop 1660 Ti is around 10% or lower.
 
If you don't need RTX just get 1660 Ti. 

The RTX 2060 will take more power and will produce more heat in a laptop.
the RTX 2060 will be 16% faster in games and will support RTX just not at high FPS in demanding games.
overclocking will produce more heat the temperatures will be higher if the laptop you are looking at does not have a good cooling solution 
https://www.anandtech.com/show/13973/nvidia-gtx-1660-ti-review-feat-evga-xc-gaming/15          those are PC graphics cards not laptop ones 
https://gpu.userbenchmark.com/Compare/Nvidia-RTX-2060-vs-Nvidia-GTX-1660-Ti/4034vs4037  this is a PC graphics cards and they do run faster than laptop ones 

Just because a display supports 4k, doesn't mean you have to play in that resolution.
 
Here's a video doing some testing on that card: