HIIT is no question good for you. A little hard to stick to.
At least for me—if I’m in the groove I keep with it. But slack off at all and I fall completely off the wagon.
I have been using every imaginable excuse to put it off.
I have somehow hung to it so far, but, as you say, it is tough.
That said, my experience tells me that tough things are the things worth hanging onto.
All the easy things I have known have been worthless...but the tough things I have earned by the skin of my teeth...
Those are the things that last.