QwerkyPengwen :
in regards to hitting 60fps you will do just fine. as for the higher refresh rate for fast paced first person shooters (with the exception of fortnite since higher than 60hz won't really do you much since it's a third person shooter) it can result in better performance on your part as a player but only if you have the skill necessary to take advantage of the little bit of improvement you get response time wise with the faster refresh rates. playing FPS games at 60hz is perfectly fine and going up is only an improvement not a requirement assuming you have the ability to adapt to the higher refresh rate and take advantage of the minor difference it can make depending.
And to reach that 100fps in a first person shooter game would be easy enough for games like CS:GO and Fortnite since they don't require too much for graphics. But as for other games such as high end AAA titles don't expect much.
To put it into perspective for you, I have an ASUS GTX 1070 Strix overclocked to 2Ghz and I only get about 80fps average on high in Ghost Recon Wildlands and 75-85fps on high in Rise of the Tomb Raider and about 75fps average on a mix of max and high settings in Assasin's Creed Origins.
All at 1920x1080 resolution.
So it won't be easy for you to hit 100+fps without going for medium or medium/high mix in games like that after you overclock your GPU.
So that is why overall I recommended you the better quality monitor that is ultrawide at 75hz for an enjoyable gaming experience. Plus, as time goes on, with your 1060 you will be seeing a drop in performance fps wise as games get more graphically demanding resulting in FPS getting closer and closer to 60 as time goes on or you having to lower the graphic quality to keep up the higher refresh rate. So in the end 60hz is what you should shoot for as your fps mark and if you are capable of pushing more than that at high quality graphic settings then that just means that you can continue to play games at 60hz with high settings for longer as games get more demanding until you reach the tipping point where you either need to lower the quality or get a better card, but with a goal like 60hz you won't come to see that day anytime soon.
So in the end, it's entirely up to you though. If a higher refresh rate monitor is what you want and you will do what's necessary to achieve those framerates in first person shooter games then go with something like the LG or the BenQ that you listed. Otherwise, if you can be fine with 60hz like most people are and would prefer higher quality graphics then go with something like what I recommended.
In regards to your first paragraph, I don't think skill is an issue. Not to say I'm amazing at the game, but I'm proud to have reached MG2 on a 2011 Mac which was already pretty screwed up before I started playing.
Also, my CPU is an i5-8400 Locked Processor, so I can't OC :/
Apart from that, I understand the issue with having to either upgrade my GPU or lower the graphics quality in a few years, as time passes. I'm not too worried, as I intend to either upgrade to a 1070/1080 within the next 2-3 years or activate SLI using another 1060.
Even so, if I were to remain with the 1060 6GB, why could I not just change the refresh rate itself (I'm pretty sure it's possible in Nvidia's settings) rather than lowering the graphics quality? As time passes and my GPU begins to have difficulty running on the settings I am currently on, I could lower it down to 75Hz and then to 60Hz and keep the same graphics.
That would offer the same solution you're proposing but still allow me to keep the 144Hz as long as my GPU can handle it. This is, obviously, if I decide not to get a 1070/1080 within the next 2-3 years or use SLI.
Do you still believe I should go for your suggestion, or should I go for the LG? Not trying to contradict you or anything, just asking for a final suggestion after everything I've stated. Thanks again.