Wow. What a great choice I made! Recently, I bought a used Galaxy S10+ smartphone in excellent condition and it's practically new (the only wear is in the battery, everything else is pristine, like new)! The only phone Samsung makes to feature a dual front camera (I think) and has way more features than the newer models (microSD, even with my 512GB of internal storage, heart rate sensor, AUX port, Dual sim without compromising on SD slot, and so much more!) The only drawback is the WiFi, Bluetooth, camera, charging speed and processor on this phone, but the difference between a newer model is minimal. It's just way better! No need for USB-C adapters and to waste money on extra internal storage!
Have to admit that the older devices were great with features. My Note FE, based on the fabled Note 7. Has all those features and Iris scanning etc. Yes the newer phones are faster and better cameras. But I just love using the older phones. Headphone jack and SD card slot I do miss the most.