Is this a honest question? It's a digital pen, an active stylus, it's absolutely amazing for writing and drawing. It has a tip much finer than a finger and works great for navigation and swipe typing. These things are an artists dream come true, we wanted this technology for decades before it became a reality. There is a reason every major tablet and PC maker provides devices with an active stylus, but they aren't for everyone.
Personally I've been using devices with a Wacom stylus since 06/07, originally for editing photos and drawing on my PC. They aren't for everyone, some people have zero use for them, some people just don't care to write or draw. When Samsung first launched the Note series over a decade ago it felt like a dream come true for me, a device I had wished I had in high school and college because that pen allowed me to do things I had only imagined in the past.
On older Note phones they were critical for website navigation IMO, a lot of websites weren't optimized for touch and it allowed the use of drop down menus. Not really an issue today. It also functions as a Bluetooth remote to trigger the camera shutter on newer devices but I'm not sure if that works on the tablet or just some phones.
If you prefer to type up notes, don't do much photo editing, don't care to draw, no need to sign documents, etc, than there isn't much use for the S Pen for you and that's OK. We all use our devices for different things.
If they were useless, manufacturers wouldn't be spending extra money to implement the technology into their devices, and people wouldn't be paying companies extra to use them. Apple, Microsoft, and others charge extra money to buy their pen. Artists have literally spent thousands to use this type of technology in the past and Wacom among others still make dedicated drawing tablets. It's far from a gimmick.