I feel the opposite with Griezmann, Morata and Rom...
For me, neither of them 2 really feel like United player, whereas Rom does.
Obviously it's subjective, and I respect your opinion (which is likely more knowledgeable than mine!), but that's one thing I've always felt with this signing - 'at least he's a United player'.
I just think with players like ADM, Falcao, Bastian, Depay there was this European glamour that everyone got excited about (myself especially), and then when it came down to it, they just seemed didn't have it.
Whereas with Lukaku, he's a proper, proven PL CF who does the business - even if he is lacking the flair and glitter of those other signings. And for me, at this point after SAF's retirement, that just feels right.
That's not to say that Morata won't do well at Chelsea, or wherever he ends up. But Chelsea are current PL champions, they can afford to gamble on pricey European unknown quantities, if they want to.
For us, I feel getting a firmly proven PL CF is much more important.
And, we mustn't forget, we have players who can offer alternatives to Rom, who will likely gel with him - Rashford, Martial, Mkhi, Mata, Pogba, and prob at least one more attacker...