It's a pity that the Bundesliga lost such a bright player, but I think Borussia will quickly find a new young talent and make a genius out of him in a couple of seasons. They have something like a conveyor 
It will be interesting how Haaland adapts to the Premier League and how often he will be injured - because this league is tougher than the German one.
Bayern usually don't let such great and young players go but unfortunately the pandemic causes financial issues with which Bayern can not spend big budget for both transfer fee and salary fee for Haaland. They admitted it via Kahn and they will have to find another striker to replace Lewandowsky but at lower cost than Haaland. It will be interesting how Haaland adapts to the Premier League and how often he will be injured - because this league is tougher than the German one.This is a good transfer for both parties; Manchester City get their talisman striker that they crave so much after missing out on Harry Kane last season; Dortmund on the other hand get enough millions to rebuild their squad and prepare for the next super star. All Manchester city needs to do is keep Haaland fit for majority of the season and they could win the Quadruple and Dortmund have another sets of super star for sale.
I am not sure about that. I am not sure Haaland will be able to adapt to Manchester City tactics and can work fine with Pep. I am not sure that Haaland will be able to change his playing style in order to avoid injuries. Premier League matches might cause more injuries to Haaland. In the current season, we see Haaland has gotten more injuries than the last 2 years.