No, Sifu, I don't think I will be replaying the last two levels in the hope of getting to the third boss at an age younger than 52.
What's interesting to me here is that I don't really feel like choosing to go back and do it better, yet I don't think this would be as bad if the game was arcade-style and if you run out of lives you simply Have To Start Over. This would also be an opportunity to get rid of the skill tree, which no action game should ever have (let me get good at using the full moveset!! I don't want to wait until the end of the game to get cool additional tools!!).

I really think Sloclap should focus on getting the fundamentals right on their next game and leave aside the interesting concepts that draw away from their exceptional action game feel.

An extremely well-made action game that uses its unique roguelike mechanics to create something memorable. Sifu is challenging and requires a lot of dedication, in line with the martial art it celebrates: kung fu.
Persistence is rewarded through a well-calibrated learning curve; once the nuances of the combat system are mastered, it becomes easier to deal with the horde of enemies the game throws at you and it's this constant sense of improvement that encourages the player to remain resilient and keep trying.
The game's ruthlessness ties in well with Sifu's main theme of revenge, which uplifts an already compelling narrative that draws upon the cinematic works that have defined the gongfu genre. The game is in fact replete with references to acclaimed movies that inspired the story, settings, and gameplay segments of Sifu (my favorite being the one that reenacts the famous hallway fight scene from Old Boy).

I would advise anyone who wants to try out Sifu to do so knowledgeably: sure, it's a pretty tough game, but after all, avenging your family can't be an easy task.