Here's a random thought: if you take the money you'd use to buy a MacBook ($1200) and deposit it on a savings account (0.8%), you'll be able to afford a new Pi every 2.6 months on interest alone.
How? At 0.8%, you're only earning 0.008 * $1200 = $9.60 a year in interest.
the elimination of an often used shortcut (CTRL+ALT+Backspace, on the default install)
If the X server needs to be killed often, that is the real problem, not disabling c-a-b. The average end-user shouldn't have to be killing the X server. For the technical-minded, there are trivial ways to kill X if need be: switching to a vterm and remedying the situation, using the magic SysRq combos, and setting DontZap to false so c-a-b does work.
"Everything should be made as simple as possible, but not simpler." -- Albert Einstein