https://bitcointalk.org/index.php?topic=5289066.0Low 40's is normal for the 1080ti and it will only get lower due to a known bug suffered by the 10x0 series excluding the 1070ti where it was fixed.
1080Ti has gone from 55 to 43mh in 5 years and 1070 has gone from about 33mh to 25mh.
I understand your point perfectly but I really want to know why these cards lose has rated over time, I am guessing this happened because of Nvidia lack of support for the graphic cards through support drivers or there is more.??
If AMD solved this problem, then Nvidia could also solve this problem, but perhaps they did not want to. The mining hype was in 2017 and early 2018, and the problems with the hashrate drop were during the period when mining was not very popular.