"Bottlenecking" only matters if it drops the framerate down to unplayable levels. The 1050Ti is good enough for gaming at 1080P at medium setting for the most part and will be the limiting factor for gaming when paired with that CPU.
You can always upgrade later on if you need more gaming performance or want more quality and at least you know the CPU will be good enough. In many games the visual difference between medium/high/ultra settings isn't as much as you might think and doesn't necessarily make the games better to play.
There's always a bottleneck, and it changes depending on what you are doing. I have a 6700K and a GTX980, when I'm gaming the CPU almost never gets fully utilised and in older games often stays under 50% but...