I believe going into this specialization can decrease the likelihood of your engineering gadgets failing. Does this apply to all your gadgets, regardless of expansion? I’d love it if my Nitro Boosts didn’t send me flying off into the stratosphere quite as often…
I have it maxed and my one tinker still fails about 75% of the time so I dread to think what it’s like without it.
Personally I just refuse to use any engineering goody that might fail. Because it is going fail, at the most inopportune time. So might as well just never use them. No use, no problem!
I use the mailbox and the repair stuff, but that is it. Used the BRez in SL and don’t remember that ever failing? Maybe I got lucky.