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You are looking at it wrong way. You might know and use MODO, but I use Blender. There is no incentive for me to learn another package (and invest into it), as I already have UE4 to and keep mastering my skills with Blender. There are many many people who use Maya, Max, Blender or don’t use any of it and are simply level designers.
If UE4 has had good CSG tools, these non-MODO folks would simply use UE4 with its tools and not have to waste time learning yet another package (I am still 100% certain MODO is no faster at level design than Blender; and I mean level design, not making elaborate static meshes to decorate levels).
That’s for indies. As for industry (working for a game dev company) - you might end up in a company that doesn’t use MODO and doesn’t allow you to use your software. With UE4 having proper CSG tools put on the same board. Passing CSG based level between departments and companies is seamless, while anything modeled requires source assets and both parties having same modeling software and same skills.
Good CSG tools is an essential component UE4 must have.