Regarding Burke, all I can think of as reasons why he doesn't start many matches is a lack of tactical awareness (Drifting away from his position too much and not doing his defensive duty which was shown against Man United) and poor stamina (Not able to last more than 70 minutes).
He struggled at RB Leipzig last season with the tactical side of the game and he wasn't trusted as a starter because of it. He is still young so he probably needs the right coaching to drill tactical awareness into him. The stamina issue can probably be improved with a specialised fitness program to improve his stamina over time.
The fact that we have been linked with Yannis Salibur from Guingamp in France, who is a fast right winger, might mean that Burke could be used more as a impact striker rather than as a winger.
He struggled at RB Leipzig last season with the tactical side of the game and he wasn't trusted as a starter because of it. He is still young so he probably needs the right coaching to drill tactical awareness into him. The stamina issue can probably be improved with a specialised fitness program to improve his stamina over time.
The fact that we have been linked with Yannis Salibur from Guingamp in France, who is a fast right winger, might mean that Burke could be used more as a impact striker rather than as a winger.