Apologies to those who have answered my private messages--thank you so much, but i still am a bit confused!

We're going to buy a platform bed, but haven't decided on a mattress yet. From what i can tell, slats are only needed if the mattress is latex and the air is humid. Correct? I'm looking at a lot of platform beds online, and most say that they "come with slats"...Does this mean there is not a solid platform? Is there a way to find a bed with a solid platform and no slats?

And, are certain beds more 'stable' than others? My primary goal is no motion; I'm looking only at beds made from hardwoods (supposedly the most stable), and they all LOOK nice online, but is there anything i need to be wary of? Also, most beds need assembly...Is this just the way platform beds arrive?

Thank you SO much for any advice!