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@nicktaylor
I take your point about browser lock-in being theoretically weaker than platform lock-in. But you may be letting a definition of "web browser" obscure the reality of how we depend on the one we're used to.
In practice, right now, switching browsers means losing (or gaining) a bunch of product-specific affordances. Most notably, as of late, the ability to use browser extensions to dis-enshittify the base browser without coding knowledge. As well as interface familiarity, etc.