bystander's vantage point; outsider sees more of the game
Proverbial yojijukugo: an onlooker can judge a situation more objectively than those directly involved. Originates from the game of go, where a spectator is said to see eight moves ahead.
From a bystander's perspective, giving love advice to others seems easy.
When watching a shogi match, good moves come to mind thanks to the outsider's vantage point.