I understand that this is a very critical aspect of the installation and all care possible must be taken for users not to mess up theirs disks completely. However, I just made an installation and after frustratingly waiting more than three minutes after every change I made (even something unharmful as changing mountpoints), I ended up closing ubiquity, firing up parted, repartitioning and then going back to ubiquity to install (after yet two more system-wide filesystem scans). I really think this is a major concern for the installer, specially as scanning multiple times the filesystems is not really critical.
I understand that this is a very critical aspect of the installation and all care possible must be taken for users not to mess up theirs disks completely. However, I just made an installation and after frustratingly waiting more than three minutes after every change I made (even something unharmful as changing mountpoints), I ended up closing ubiquity, firing up parted, repartitioning and then going back to ubiquity to install (after yet two more system-wide filesystem scans). I really think this is a major concern for the installer, specially as scanning multiple times the filesystems is not really critical.