Smirker, Watkins is only behind Salah and Haaland over the past 5 years based on your criteria for goals scored. On that basis, what more need he have done to be a good striker?
You say it like there are loads of top strikers he has outscored.
How many teams have been in the PL for that full five years? That takes out a fair few who have been relegated or promoted, so players for those teams will have played fewer games. Then how many of those were guaranteed starters and the only striker for the majority of that time?
Kane left for example. Agüero retired. Isak hasn't even been here five years. Son's last three haven't been quite as good but the five before that, he outscored Watkins playing as a support for Kane. MU have been shit.
He's done it not because he's a good goalscorer but by virtue of basically being one of the few strikers to regularly play for the entirety of that five years, because we haven't bought anyone else or given anyone else a run (because he can't cope with competition).