Okay this is half meme but I gotta unload my thoughts anyway
Primarchs do love and if someone says otherwise I think they've never opened a book containing one. Reading about bricks without attachments for 500 pages across an ungodly amount of books would suck ass and I am pretty sure the writers know that. Romantic love is a specific kind of love that they do show little evidence of, but that reading is a super narrow understanding of love.
Their love is often kind of sideways and somewhat different from how your average human experiences it. I think their threshold for being "person who matters to me" is absurdly high because they were made to look at the macro rather than the micro. They were made to conquer a galaxy with unimaginable violence and conviction, and certain emotional muscles are therefore stunted beyond recognition. They are warlords. Some of them were marginally nicer about it, but even those killed billions in their conquest. In my opinion individuals cannot be easily emotionally visible to them for them to fulfill their purpose like this.
The only one I have some actual book expertise with is Guilliman, so I'll look at him specifically. He loved his adoptive parents. Konor's murder drives him into deep grief. When Euten was threatened by Curze in Unremembered Empire, Guilliman is so concerned about her safety that he is suddenly able to step through the Pharos device and instantly travel from Sotha to Macragge, which works through your wants and needs.
He loves, broadly, humanity as a whole. He is often cold and unempathetic towards your average baseline human because he is trained to look at the macro, he will waltz right over your feelings because they're speed bumps to him in his plans (he even does that to his sons in Lord of Ultramar). He is also so absurdly beyond them mentally that I don't think he can easily connect to your average human individual. You've got to be truly exceptional for him to have any feelings about you beyond 'where do I slot you into my design'. It is not impossible, he does it occasionally, but not for everyone.
Astartes are a bit less problematic in that regard though still far beyond comparison, but even there his love is often structural. He tries to teach them to be statesmen because he wants them to have a place in the world "after war." That requires caring about what happens to them. He will walk right over individuals if he deems it necessary. (Again, Lord of Ultramar.) Almost like purpose is intertwined with affection for him, and giving you your purpose in his system is how he expresses his care. No, you are not required to like the place he has picked for you, he will place you there anyway. This is more my personal interpretation across multiple books than hard fact though.
But that is the thing. His love for them as a group is pretty evident, but love for an individual is, in my opinion, more rare. I imagine it would be hard to reconcile that with sending them into battle constantly, so that impulse has to be stunted by design.
Canonically, specifically romantic love is probably mostly off the table for them, though Fulgrim did make that one statement about maybe having loved some of his spouses. But even then it is unclear what kind of love that was.
But like. Fan content is fan content. Canon is a suggestion lol. You don't even have to do a lot of ignoring, some things are just never really stated or left ambiguous.
In my honest opinion trying to cleanly excise only personal love from an individual while leaving loyalty, filial love and duty intact is kind of insane on a realism basis, but I know this setting operates so far off from reality it is kind of a moot point.
Astartes feelings are more complicated and I am honestly less well-versed in them anyway. They came from baseliners, but they're physically warped by the process that made them Astartes. I don't think they are incapable of fraternal love and they show signs of it often. There is also love for their gene-sire, which is engineered, but there seems to be some flexibility.
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