I keep RB and use it to preview MIDI files that people send me or I find roaming the internet. It is quick and easy for me to do that. Besides the integration with BIAB which makes it best for that. I use Sonar (well Cakewalk now) and Cubase as well. Just depends on what I am doing. I think it only takes up a few hundred MB which doesn't seem like a lot nowadays. Of course I remember my first 20 MB hard drive so ...
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2022 Audiophile, Windows 11, Cubase Pro 12, Cakewalk Sonar Platinum (now Cakewalk by Bandlab). A bunch of other stuff.
Guitar player extraordinaire.