Unified API Disclaimer (#1193)

With the work on hubs and scopes refactoring, this page needs a disclaimer even more than before https://develop.sentry.dev/sdk/hub_and_scope_refactoring/


---------

Co-authored-by: Anton Pirker <anton.pirker@sentry.io>
Co-authored-by: Alexander Dinauer <adinauer@users.noreply.github.com>

src/docs/sdk/unified-api/index.mdx

@@ -2,6 +2,20 @@
 title: 'Unified API'
 ---
 
+<Alert title="Note" level="info">
+
+Everything written here sounds real nice. However, we live in a practical world, and expect each platform to adhere to what makese sense for the developers there. What is written below is not to be taken as strict rules. It is a guide and to be thought of as a tool to help developers build SDKs which work well which eachother.
+
+The top priority when building SDKs is a high quality API and developer experience, don’t let unified API be an excuse to build things which don't make sense for a given language.
+
+*Types Example:* Typed languages might have very different developer experience than dynamic.
+
+*Platform Example:* Does Rust have exceptions? Nope, don't name APIs for rust like `captureException`.
+
+*Unified API Example:* We don't like Hubs and Scopes anymore, and we are redefining that, <Link to="/sdk/hub_and_scope_refactoring/">Hub & Scope Refactoring</Link>
+
+</Alert>
+
 New Sentry SDKs should follow the unified API, use consistent terms to refer to concepts.  This
 documentation explains what the unified API is and why it exists.