Maybe all that's needed, but I take what I want when I travel, not what I need.

As said upthread, I'd rather have something and not use it in preference to want something and not have it.

Examples. Dress clothes for an unexpected function/party. Personal sports gear I'm familiar with rather than hiring. Preferred brands of toiletries rather than hotel knock-offs. Charger (even for my Kindle which will last a while without charging). Gifts from my home country. I'm sure others could add to this list.