Is the HP 17T good for gaming?

No. It relies on Intel Iris Xe integrated graphics, which handle video, browsing and light photo work but not modern games at high settings. A laptop with a dedicated GPU is the better fit for gaming.

Can I add more storage or memory?

HP lists expandable storage, so the SSD can be upgraded. Memory is DDR4; check the exact configuration's slot layout before buying extra RAM.

Is the 17.3-inch screen too big to carry?

It is a desktop-first size. At roughly 15.8 x 10.2 inches and 0.79 inches thick, it fits large backpacks but is heavier and bulkier than a 15-inch laptop.

Does it have a numeric keypad?

Yes. The keyboard includes a numeric keypad and a backlight, which helps for spreadsheets and low-light typing.

Is the Core i7-1355U fast enough for office work?

Yes. Its 10 cores and 5.0 GHz turbo speed handle email, documents, video calls and heavy multitasking comfortably. Sustained heavy loads are limited by its low-power U-series design.