I am printing a part that is tall, but most of the plastic is in the bottom 3mm. If the GCode Preview had a "progress bar" or something like that to show you the percentage of filament used (or grams used, or mm used, or anything helpful like that) at given layers, that would be very helpful in determining an ETA...especially considering the Build Time is so inaccurate.
Thanks for considering it! I hope you devs are staying safe and productive...