MechaPilot
Explorer
You're over-analyzing. Especially because my point still stands. Even though, yes, any class can get it through backgrounds, it sill costs them something, even if that something is as small as a tool proficiency. Rogue's get it for absolutely free.
Rogues don't get it for free either. Everything costs, even if it's not readily apparent. Rogues have it at the expense of proficiency in another tool or language, just the same cost other classes would pay through backgrounds to get it.