I don't dislike how tieflings look now, but... 4e/5e took the best thing out of tieflings. The variety. Let me create a tiefling that looks almost human. Or one that looks very fiendish, but in a different way than hellish tieflings. What about abyssal tieflings, hag tieflings, yugoloth tieflings, rakshasa tieflings? Tieflings with digitigrade clawed legs, with hooves?