I'd agree with everything said, however, I do think having at least 1 linerless slippie is nice. I only have one, just got it recently, but like it alot. It's a P.C. Randall Wharncliffe (He hasn't named it), but it's big at 4.25". While the weight savings doesn't seem like much, it's definitely noticably lighter than a Shadow with a liner.
I have a Menefee Backpocket Shadow (4 1/8") in green canvas micarta & the Randall (4.25") in natural canvas micarta is definitely lighter.
I haven't had the linerless long enough to say anything about it for the long term, but it would seem reasonable/logical that a linerless "could" have problems down the road due to dirt & wear on softer handle materials.
I would say that maybe a linerless wouldn't fare that bad vs a brass or softer metal liner knives. I believe my liner customs have 410 or 416 SS, so I'm sure they take more punishment (If I was so inclinded) vs the linerless versions.
Good luck with whatever you choose.