My wife's employer and my own both offer good 401(k) plans as well. Low-fee options, transparent and reasonable plan fees, lots of cool options like generous after-tax contribution limits and in-plan conversions.
Here's a potentially great reason to do what you're thinking: if you make too much money for direct Roth contributions, then depleting your IRA could reduce your liability on back-door contributions. (I've never had a traditional IRA balance, so I haven't done due diligence on that, but it seems like it should work.) Even if you don't make enough now for that to be a problem, it could become one if you're single now and get married later. The limits aren't much higher for married couples than single ones.
Here's another good reason: ERISA liability protection. Now, I'm not super-familiar with these how these laws interact with IRA rollovers either, but from what I've seen, it looks like money in your 401(k) is completely untouchable by creditors, regardless of what state you live in. IRAs are much spottier, with some states extending protections and others not doing so. Personally, I hope to be completely judgment proof in about twenty years or so, and that boils down to positioning ourselves so all our assets are covered under ERISA. Again: not sure if the protections attach to money that gets rolled over into the account, but I'd be a little surprised if they didn't.
Do get familiar with the SPD. Do lobby your HR folks for better plan options. If you have a good plan, it's because they listen to other people in your company like you, so add your voice to the chorus.