The tow-boot software devs goes out of the way to say they are offering a boring PC boot loader experience so I wouldn’t expect any advanced features other than booting from devices.
PC boot loaders have been able to fall back to previous configurations on boot failure ("automatic redundant OS upgrades") for a long time[1], so that's not a valid excuse.
https://systemd.io/AUTOMATIC_BOOT_ASSESSMENT/
https://www.gnu.org/software/grub/manual/grub/html_node/fall...
https://www.gnu.org/software/grub/manual/legacy/Booting-fall...
[1]: Minimum about 23 years, from personal use in creating a product with A/B-root partitions.