Generally speaking, upgrading the brake unit will improve braking performance, reduce weight, or both - but if your intention is to neglect them the only difference will be that the upgraded ones will cost more to ruin.
Keeping a bicycle clean and lubricated is best done as a regular activity and it will pay dividends in terms of reliability, reduced wear and tear, safety and ease of riding.
I am a little obsessive at times, but I just can't comprehend why so many people on bicycles ride with almost flat tyres and rusted chains.The maximun effort used to inflate a tyre with a half decent pump will be less than the extra effort required while riding to overcome increased rolling resistance - and you will be much less likely to have a puncture.