Ipads

I use an iPhone 6s as my "daily driver". It is the same phone as yours, only the smaller size. I also use an iPad 6th Generation alongside it. From my perspective, the biggest reasons to keep my iPhone 6s and iPad 6 are the physical earphone jack and TouchID (not FaceID).

One feature that no iPad has, whether WiFi only or WiFi+Cellular, is a built-in telephone. There are some telephonic features available if both iPhone and iPad are signed in to the same Apple ID and are within Bluetooth range of each other, but an iPad is not a cellular telephone. Cellular models have their own Cellular Data radios but not Cellular voice. And you cannot hold it up to your ear like a telephone.

Whatever you decide, make sure that you get an iPad with enough storage memory. For an iPhone 6s, 6s+ or iPad 6, that means 128GB. The iPad 6 is three years old now, but it is the device that most closely resembles the iPhone 6s+ you enjoy so much, and it is readily available on the new, refurbished and used markets. I would expect that you would have no learning curve at all, except perhaps getting used to where the volume and lock buttons are located on the iPad and the fact that it weighs about a pound.

Good luck.

An iPad is basically an oversized iPhone. Many of the apps you find for your iPhone will have a counterpart on the iPad. Beyond that features are going to be nearly identical as well. Is there something specific you are looking for in terms of usability or an app?

The touch you speak of was a combination of software and hardware. The 3D Touch as it was on devices of iPhone X and earlier isn’t so much a thing anymore as it is a long or short press, but the functions are basically still there.