I can understand why.
I own an area. I'm judged by that area, and that area alone. Leadership doesn't care that I helped cash out 20 guests, they care that I didn't finish my push, shoot my outs, zone my aisles, or locate my backstock. Those are the things that will affect my review/raise. The Guest Advocates aren't going to come bail me out with my workload when they have downtime, yet I should rush to their aid as many times as they wish despite being given 8 hours worth of work and just 5 hours to complete it?
TLs and ETLs should be jumping on those lanes to help out. Or they should be taking over for us TMs when we're summoned to the lanes. I'm a Dedicated Business Owner, and my business is GRC2, not cashiering.