You just said it yourself "until" rashfords injury. If Ronaldo had gone to city the entire narrative would be different because utd could quite easily be in the position of only having martial and greenwood upfront and cavani whos also had injury issues and looks to be off to barcelona in January. Martials form has dropped off a cliff, greenwood as roy keane would say is "still young and learning his trade" and as talented as he is cant be relied on to carry a season because the dude is tiny physically because of his age.
Utd are not over stocked in strikers its quite easy to utilize a player like that without playing them every week in and out. But he does because the alternatives are not good enough.
One could argue its effect Bruno's performances because his numbers have dropped maybe there is something in that.
But come on, fred would still be playing regardless if it was van nistelrooy in his prime because his off the ball work grants him a starting position.
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Also notice how theres no where near the level of criticism for players like Jack Grealish and Lukaku. Players who cost near 100m or in Grealish's case did cost 100m.
But yeah Ronaldo scoring goals = bad.