not at all the same thing as wanting a first party to buy a studio. but as usual, not going to get into a pointless argument with you.
It's not exactly the same, but the ramifications are similar. Eg, one or more platforms still lose out with your Nintendo collaborations for a set period of time, whereas with acquired studios it's of a more permanent nature.
But look at it from the perspective of those gaming on single platforms; In this current climate of acquisitions almost being a norm (thanks predominantly to Microsoft), a non tentpole third party studio not being purchased by said preferred platform, means more of a chance of it being acquired by a competing platform. Eg if Microsoft doesn't aquire Remedy, there's a chance Sony acquires them instead, and vice versa. And then there's the chance of more third party exclusivity deals etc too even without an acquisition.
In other words, multiplatform titles are not guaranteed either way (especially if a major multiplatform release(s) underperforms and puts the studio in a vulnerable position, more open to outside funding or acquisitions), and it's not surprising non multi platform owning gamers are concerned about studios being acquired by a platform they don't game on, or the opposite being true.