A person who watched Tennis in 2000s would know that Murray was never mentioned as a problem for Federer, not once. It was always Nadal who was mentioned because Nadal was a real problem. Pete fans used to mention Nadal to question Federer, guys like Wilander mentioned Nadal..... not Murray. Sir Andy Murray was a young bloke whom Fed did not take seriously until 2008, at least not serious enough to ensure that he went all out to win come what may in those matches. You should be knowing this but since you don't and the way you write it is evident you never watched any tennis in 2000s or 1990s. You saying you are watching from early 90s is all a fairy-tale you spin up to look cool and mature but in reality maturity should be evident from our narration of events, not by claims alone. Among the prominent Djokovic fans in this forum Hitman has watched tennis throughout the 1990s, one can make out by reading his comments, but not yours, Sorry to say this but it is my observation. You do have knowledge of history and facts about the game, I will give you that but no you were not watching tennis in the 1990s or 2000s, maybe you were a casual fan of the game in 00s but definitely not a full fledged viewer because otherwise how are you saying Murray troubled Federer? It is wrong to say, lol.
Please understand this --->>> If Federer actually was troubled by Murray then Federer would never have been able to turn around the H2H and cover up for all those matches he took lightly. You dont get troubled by someone in your 20s and early 30s to turn around the H2H when that guy is younger to you by 6 years. Djokovic was troubled by Federer in 2000s and he turned it around from 2010, now that is how you turn around something. You don't turn around a h2h vs a younger guy if he troubled you, the result will be a Nadal scenario.... Nadal actually troubled Federer from day 1 and that became a big problem for him over the next decade or more.
Federer NEVER trailed Murray in the real H2H i.e Slams H2H. Trailing H2H in non slams is not a big deal.