04 H1 lockers and BTM question

[It\'s a Dry Heat]

I'm not a Bing(shiny) type of guy when it comes to my Hummer. More like it can follow a tank anywhere and looks and sounds like hell. My question is if the BTM was good for the older H1's why is it important to separate the front and rear Eaton elockers. The old days if you need traction, BTM, keep the RPM's down and forge ahead. Why not with the elockers. My questions comes from the dealer adding an Eaton elocker to my H2's front dif and just made it hot. Another words push the button and it's locked No ifs ands or buts. I know at times you may not need the front or the rear elocker at the same time but what does it hurt? BTM seemed to work find. So I was thinking on whats wrong with hooking my front and rear dif together?