A desk-length mousepad is mostly for looks.

Not really.

If you’re asking about raw productivity—pointer accuracy, speed, wrist comfort—a standard medium pad does everything a giant one does. The tracking surface is the same; you just get more real estate for your keyboard and a place to rest your coffee.

The only practical benefit is desk protection. If you have a scratched-up surface or a glass desk that eats mice, the big pad covers everything. Otherwise, the extra space doesn’t make you faster—it just gives you room to push your keyboard around or set your lunch on. For most people, the “productivity” claim is aesthetic.

But if you want to feel like a hacker, go for it.