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I do not think Kyle had this in mind. As a member of a team, they are all aware that there are games where their strength is needed and other games where other people's strength is needed in the game. Kyle Walker is a fast defender and against some very fast wingers like Vinicius Jr he is an excellent choice to close them down, but for some other types of wingers in the champions league, Pep had a better choice. Everything is to the teams success. It is like he wants a new challenge, maybe that is why he wants to leave to another club.
Kyle Walker will turn 34 in May, so it may be important for him to adapt to the relatively easier competition compared to the Premier League. The Bundesliga is not as strict as the Premier League, so it might be good as one of Kyle Walker's considerations for the upcoming season.
Kyle Walker is still very fast for a right-back, but as he gets older his performance and speed will certainly decrease. I still think Kyle Walker could play for Manchester City for the next few seasons, but I don't think it will be more than 2 seasons. Pep Guardiola must convince Walker to stay until he at least finds a suitable replacement for him.