One should always let sleeping bags lie, in my experience.

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Hear the challenge, learn the lesson, pay the cost.

One of life’s lessons we all learn in time

Well,
I have had an expensive sleeping bag with feathers for long,long time.
Always very nice. I have often been sleeping well in temperature below freezing temp. The water was frozen in the morning.

Finally, the bag was flat. Feathers were leaking. So I was white in the morning.
It was far from as good as decades earlier.

So I went to buy a regular 3-season bag. With comfort temp of some degrees over 0 Celcius. And I froze so much.... Even when it was not really cold outside. The new bag was nothing to have compared to my very old bag.

So I invested more money. In a better bag. Still far from what I was used to.
So maybe I have to invest a third time in something really expensive. And than I will have good comfort, for the rest of my life.

Lesson learned:
It is expensive to buy cheap stuff. Because it will not work OK. And then I had to buy "real stuff". And the money that I spent on cheap/medium stuff was wasted. Better if I had invested more direct.

And I have done the same mistake also for tent, sleeping mat and riding gear. Not that I have bought the cheapest. But what I thought was "good enough". And than I needed to replace it with better equipment. I still use the medium equipment during warm summer periods, for weekend trips.
(It was painful enough with a sleeping mat with broken valve => flat for one night during a weekend. But for a long trip....)

Even if it ends up to some cost, it will soon be cheaper than hotel rooms.
at least when I travelling in Europe. And comfort is worth its price.
(And I like sleeping in tent. I have tried Hammock some nights this summer. When wild camping. And I liked it)