Its not like they are the exact same tool.
I have a ton of Ryobi tools and am perfectly fine with them, but they are not designed and built to the same standards of use and durability as Milwaukee. That’s why companies have multiple tiers to cover everyone from the occasional user to the professional. Some companies really go nuts with that and have seemingly a million brands (I’m looking at your SBD) but thinning out a company’s lineup of too many brands is sometimes very tough from a customer loyalty perspective.