Really... why? Nostalgia? It certainly isn't because "digital can't reproduce the sound of spring reverb", because it can. And it's not because spring reverb is more "natural", because it's not. Whenever you hear reverberation in nature, it's because sound waves are bouncing from one flat surface to another and dissipating, not because we all live in a giant metal box with huge springs stretched across it. Spring reverb is no more "natural" than, and is in fact just as artificial as, digital reverb. My opinion (of course) is that we're deciding between fake reverb from an IC as opposed to fake reverb from a mechanical device with moving parts that do go bad... and in 2019, what in the heck is keeping guitarists from moving forward with proven technology? One of the best, smoothest spring reverbs I've ever had was in a Mesa Boogie Studio 22 combo I had. But it still wasn't as smooth as the digital reverb in my inexpensive little Vox AC10C1.