I have taken everything I felt I didn't need (or intended on using at this time), snaked it through the firewall and neatly bundled it up with zip ties and hid it behind the dash. Nothing irreversible! Keeps resale value higher!
Put the clippers down!
A key interest in any investment is making wise decisions that protect your investment, and ideally making decisions that have the potential to add value. Long story short, don't eliminate, but hide what you feel isn't necessary, you will never regret spending a little extra time to retain those wires(by hiding them), but It's safe to say at some point you may regret completely removing them.