I've got about 7 - 4 plexes and after closing I moved them all to an LLC. Yes, you are correct you won't be able to change the loan as it's residential, but it does allow for some asset protection. They all moved over and it did not trigger anything from the lenders.
You will want to take an extra step when it comes to the insurance. Our personal names are on the insurance docs since it needs to match the loan docs since they pay for it out of escrow. But you will need to request for the LLC to be named additional insured. I also have our trust named additional insured but not sure if that applies to you. The insurance company will do this for no additional cost.
You are right, the veil of asset protection could be easily pierced, but that is more a function of how your LLC is set up. If it is just a sole member LLC then very easy to pierce. If it is you and your wife, still easy to pierce. The best advice I've rec'd is to have a 3rd party, no doubt someone you trust, as a member of the LLC. They could have a minor share in the LLC and you can structure it so that they receive 0 of the profits. In that scenario piercing the LLC would not be so easy. Possible, but not as easy. Unfortunately, sometimes its dependent on the judge you get. Hope none of us ever have to get to that point.
The only way you can get your name off a loan is if you 1) ask your lender and 2) have at least 50% equity and still it is unlikely. I always ask anyways and as the assets mature and loan is reduced, you bet I'll be getting our names off.
It doesn't matter whether the title is held in the same name as the property management LLC. And I would challenge the idea that running your operation gives you any ability to acquire other properties in an LLC. You will be able to use an LLC but only when you get to a commercial loan. The lender will require it and the property will have it's very own LLC - nothing else tied to it - to protect the lenders interest. Even in that scenario, the loan will be under the LLC name, however they will require you to guarantee it personally. Unless of course you are putting 50% down.
I would say the benefits of running everything through the LLC comes down to organization, reporting, and being more credible when you decide to step up to a commercial property. Being able to turn around all my P&L statements made me more credible when presenting my business to the bank when I stepped up to commercial. Streamlined, professional and showing a profit. :)