Okay, you're clearly getting your panties all wadded in feeling your purchases and epeen invalidated.
None of this implies maximum fps capacity for these cards in any absolute sense. You're injecting that yourself. It's obviously relative not only to the game in question, but the rest of the system.
The defacto standards I wrote above are a widely accepted and used means of communicating to noobs who don't know these things which hardware is going to be the best general fit per resolution and refresh rate across a range of current and popular titles and considering forward compatibility.
Hz and fps ARE NOT the same thing. Hz is the monitor's refresh rate (potential/max) whilst fps is the actual output from the gpu.
The reason the 1060 is advised for 1080p 60hz is because this is the current norm gold standard, and PC gamers operate by the accepted standard of wanting 60fps minimum (as much as possible) on a 60hz monitor. The 1060 should provide this (and sometimes slightly more, occasionally a lot more).
The reason the 1070 is advised for 144hz is because it is more likely to sit above 90fps on average on a 144hz monitor, which is where the gains of the faster refresh rate are more apparent.
Because the experience of higher fps and refresh rates are subject to diminishing returns and exponential costs, they're attributed a non-standardized and enthusiast assumption (ie: people paying more for more performance/experience). As the cost of the gpu increases, so too does the assumed cost of the monitor thus output. Hence a gtx1080 isn't generally matched to a 1080p monitor, even though a handful of games barely hit 60fps with them. They're outliers. Just like you wouldn't suggest someone pair an i7 8700k with a gtx1050 or a Pentium g4560 with a gtx1080ti.
All of these propositions are a combination of individual price, performance, total system cost, and reasonable expectations for price/experience.
Anyway, if you want to learn more Google is your friend. I'm also happy to teach you more about system building if you like.