Re-amping is a technique that gained a lot of popularity in the last 15 years. The technique’s obvious advantages are numerous:
Direct recording is an ideal way to reserve tonal flexibility for mixing (especially useful in the DIY world);
Instrument amplifiers and stomp boxes offer virtually limitless opportunities to create the right sound with a not-so-virtual interface;
It’s fun, which is still allowed.
Sometimes the re-amping goal is simple. An electric guitar can be recorded direct while monitoring a software amp simulator. During mixing the direct guitar track (sans faux amp) will be re-recorded through an actual amp.