Reframe to argue against sessions as a concept rather than against a
hypothetical opt-in alternative. Add citations for real-world client
session behavior, an ecosystem impact survey, concrete server examples
(Linear/Notion/GitHub/Stripe), and references to SEP-2322 and SEP-2549.
Clarify that explicit handles are a design pattern with no protocol
surface, address request-ID and pagination-cursor re-scoping, and tighten
tone throughout. Remove open questions, follow-on sections, and the
comparison table.
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