Hello,
Another vote for the T.16000M + Throttle. I have the orange light one with Throttle for a year and it's great. Previously I had the old green light one and that went to my son when I bought the new (identical) model with Throttle. Still no issue with the old one.
And here is one more vote!
I had (still have) the T.Flight Hotas X and was very satisfied with it. Especially for just 45€, but the T.16000M is better.
I like the switches instead of buttons
Another thing about the T.16000M Throttle companion: it has a screw for stiffness. Some silicon grease may help, but 90% of the stiffness issue you can alleviate by using the screw.
basicially you are right, but the difference in smoothness with using a good silicon grease - you feel it.
The breakaway force (correct word?) is close to Zero!
Open the throttle at it base plate. it is easy and nothing is falling apart

.
Clean the sliders with something soft, microfibre comes to mind, grease it with the Aeronix PTFE-grease (bought in Germany - Conrad, Amazon, Reichelt), adjust that mentioned screw, close the throttle again and you will love the result.
Don't use any oil like WD40 or other oils. Maybe silicon spray but just with the snorkel. I really recommend the PTFE grease