Okay, this might be ... just semantics ...His burdens are for sure, light
Somewhere in the OT, God told them because they called His Torah or Instructions "a burden", they were in trouble. I don't remember where, or if they got punished for that... perhaps it was also where they grumbled? , and even though they did do what God said to do, they were punished, because they grumbled...
Then, in the NT,
Jesus says "His commandments are NOT A BURDEN (i.e. not burdensome) , but light and easy" ...
i.e. perhaps a light burden - but not with the thought of being actually a burden , not at all a hardship or difficult....
So the ... nuances ... are , here, just for the 'back burner', ? , maybe not a main point, yet maybe so, maybe an important one...