Well, differing opinions are good – would be boring if we couldn't make controversial or debatable calls where these GOATs are involved.
For me, that Billy No Mates attack is much more problematic than harms' – and it's problematic on several levels too.
The more of a playmaker Messi is, the less seamlessly he works in a combo with Platini. In other words, the Messi incarnation we're discussing presently is much more of a headache than the younger version, who you can plausibly enough field as mainly a finisher – and not that much of a free roamer either (at least he roams in a more limited area).
The Ronaldo-Messi combo is problematic too – some won't like it at all. For me, it would work in theory – and if it works, it's obviously an insane combo. It has question marks over it, though. The way Ronaldo actually plays, he requires a lot of service and he usually needs a far amount of chances to score – it's hard to see him as anything but the so-called focal point of the attack, at all times (when he isn't, he usually becomes an almost redundant figure).
And Van Basten hasn't been mentioned yet. He's a natural focal point himself. He offers much of what Ronaldo does as a finisher. You already have three finishers in the team who could all plausibly be called the primary one in various possible configurations – so Van Basten isn't really needed in the capacity he usually excels at. If we're talking balance, my inclination would be to put a pure holdup player up front – someone who is there almost exclusively in order to facilitate and play link-up, some kind of water carrier if you will. Van Basten strikes me as a (pretty spectacular) waste in such a role.
None of this means that it wouldn't work at all – or that I'd necessarily consider it inferior (that would, obviously, depend on the opposition). But at first glance I see multiple possible problems there – it would take much more of an argument, on the detail plane, to convince me that this attack would be fluid and brilliant. Whereas harms' immediately struck me as making sense. Ideal? No – but pretty smooth, not overcomplicated, clearly no clusterfeck, etc. In short, I bought it straight away – no serious questions asked.
So, there it is again – very different views on some things. Which is – again – good. It's how it should be, as long we're able to discuss things in a more or less civilized manner, and offer something resembling sense when we state our reasons.