I am suspicious that a lot of what is claimed as ‘BIFL’ has been enshittified
Sadly, I'm sure this happens a lot in the name of "marketing".
There are a few things that I look at to help ensure the best chance of getting something that's BIFL:
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Does the company or product have a good track record? I'd trust my Leatherman to be BIFL over whatever no-name clone you see on Aliexpress.
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Does the company offer a lifetime warranty (or one that's 20+ years)? If so, has the company been around for decades?
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Is the item repairable and easy to maintain? Even if something isn't marketed as BIFL, you can likely extend the product's life by decades through simple maintenance and care.
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Does the item have any built-in planned obsolescence features? Proprietary built-in battery? Components that are glued in place? Sealed shut so you can't open it without destroying the item? etc...
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Is the product simple or complex? The more complex, the more likely it will fail, but this isn't always the case if you are able to maintain/repair components.
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Textiles can be tricky, but not impossible to keep going for decades if the quality is good enough.
Sadly, I do think that many companies aren't interested in making BIFL products because PROFITS!!! I think the market for BIFL will be more with custom fabricators and small businesses.