Why do programmers use the same old laptop???

The field of programmers is very diverse, the people, the tasks, the real needs also are. As are the usage patterns. Some of the reasons why I am using old laptops (this is a Mac environment I am having):

• We would really need desktops, but are using laptops. Battery life, screen quality do not matter much.
• We have several monitors connected, already have SSDs, big memories, attached keyboards, mouses. Connected outside storage terabytes. Connect to outside systems, tools. The machines are always plugged in into power, always on the net, most of them are always running. We use virtual machines. The emphasis goes away from using only one machine. We use several machines, not just one laptop.
• The machines are under very heavy use, are worn, torn, but still working great and flawlessly. Kinda attach to our hearts. Since we use several machines, they get their own personalities. Every one of them is having a different role. We remember their roles.
• We use different machines while traveling. The portable stuff is different from the main machines. The game environment is different from the main machines. The majority of intense work is done not while traveling.
• It is a pain to set up the environment on a new machine (There always are so many little details, compatibility problems, things to invent or just to reinvent). So we keep the old environments running as long as they serve us, and set up a new machine only gradually, adding stuff step by step only when needed. Setting up the environments are getting simpler, but still take away time.
• In older times I needed to reinstall or just defrag my machines several times per a year. Now those machines are just working for years, unchanged, upgrades are smooth (KOW). Just got used to sitting down, doing stuff immediately.
• We are getting more specialised, the urge to know every detail of every environment diminishes, we just hate to spend time reinventing the trivial problems of setting up a new environment, finding the conflicts. We concentrate our interest on the area we really work in.
• And yes, this is a misconception. We are using several machines, old ones and new ones at the same time. Just using the old ones to their more fruitful life.