Quick A: No

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Are the experimental features of modern C++ reliable for long-term projects?

Is it guaranteed that all compliant compilers have the same experimental features?

No, experimental features are optional.

Are experimental features prone to big changes that make them unreliable?

Yes, the C++ committee might even decide to abandon a feature or in the process of standardization a defect might come up that would force a feature to change.

Generally, it's not a good idea to depend on experimental features. Experimental features are exactly what the word says (i.e., to experiment with).