To chime in on this topic, For me it's convenient. I log into multiple computers with (LastPass) installed. I use it on all my devices. However, At this time the only method that has the LP-Authenticator is my Note-8, Therefore If I'm at work and happen to need the authenticator and my phone is in my vehicle, it would be saving me a lot of time. My work PC is secure. Once I walk away or leave my desk, my workstation & domain account is locked. This action takes place within 30 sec after leaving my workstation. Same with my personal Tech computer or gaming rig at the homefront. If my phone is not within arms reach, it becomes time-consuming to find the phone. I'm just that type of person. I have a lot going on and have charging stations throughout the home and use all of them.
Don't get me wrong I have many other personal and work devices, that I enjoy & need the full protection of (LP). However, I also have a few home PC's that I would like to have an LP-Auth app on where I need some protection, and as long as I don't have the Authenticator Icon in plane site, I would feel safe enough being able to make a few clicks and utilize the Auth app to log in quickly. I'm also currently testing (LP) for allowing logins to specific software on specific workstations. Example; I give (John Doe) permission to log in to Quickbooks or Fishbowl on WS-003. He then goes to WS-003 pulls up the software and request Authenticator code. I later msg him the Auth-Code instantly through the network, it pops up on his desktop. John Doe can now login into Quickbooks giving him a single login session, that will request new Auth-code after 5-min without action or after a logout. The Auth-App seams to works great in this type of application as well.