The T550 gets 21 hours of battery life [1] so I'd say those candles are pretty well matched, especially given the possibility to swap one of the batteries in the T550 with a charged one without the need to shut it down which can extend the runtime well past what that Macbook Pro gets.
With T550 you get a computer with decent keyboard.
With M1 Max you get a Mac.
Even the best quality Mac keyboard is completely unusable for me and the OS feels like it is fighting you at every corner, I haven't been that frustrated since Windows Vista, so even if the CPU was 1000x faster, the user experience for me is horrible.
My old Samsung T700t with 2nd gen i5 and a dock keyboard feels like usability king compared to every Mac I ever used and it also feels much faster once I swapped Windows for Linux.
[1] https://www.notebookcheck.net/fileadmin/Notebooks/Lenovo/Thi...