I’ve been using my current desktop for almost 8 years now and it’s still running quite fine! In order to support 3 monitors, including at least one 4K, the graphics card did get an update to a GTX 950 a while back. But other than that it’s still exactly the same and quite performant. Development is snappy enough, browsing still superb and doing some light modifications in Lightroom or Photoshop is doable.
For some time now I’ve been in possession of the Sony PRS-T1 e-reader. E-readers are great devices and I find it much easier to read from an e-ink screen compared to a regular tablet screen.