I have a Robot too and also love it.
Had the inlaws over on Sunday and made 6 shots back to back on it. As you say it's just rinse and reload. No problem for two shots back to back, not ideal for more but once one get into a rythym it's fine. Having a kettle that holds at 100°c defo helped.
I had a Silvia before that and doing six shots back to back on that would have been impossible. The temp would have been all over the place after two shots, temperature surfing would have been a nightmare and I'd be getting gushers by shot three.