Is the HP ProBook 4 G1i good for gaming?

No. It relies on Intel integrated graphics, so it handles casual and older games only. For modern titles you need a laptop with a dedicated GPU.

Can I upgrade the RAM and storage?

The 2 TB SSD and 16 GB of DDR5 memory are generous out of the box. Business ProBooks generally allow storage and memory upgrades, but check the service manual for this model before buying.

Is a 16-inch screen too big to carry?

It is fine for commuting between home and office but heavy for daily all-day carrying. If portability matters most, a 14-inch model is easier.

Does it come with Windows 11 Pro?

Yes. Windows 11 Pro is preinstalled, which adds BitLocker encryption and domain join over the Home edition.

What is the difference from the ProBook 4 G1i 14-inch?

The 14-inch version has the same platform in a smaller, lighter body with a smaller screen. The 16-inch gives more screen space and often more room for cooling and storage.

Is the Core Ultra 7 255U fast enough for video editing?

It handles light editing and photo work, but long 4K timelines will be slow without dedicated graphics. For serious editing, look at a mobile workstation.