Update README.md

README.md

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 # Wallet Mock
-Fully functional E2E tests for your dApp. Installs a fully operational Mock Wallet into the [Playwright](https://github.com/microsoft/playwright) Browser Context, making it discoverable through [EIP-6963](https://eips.ethereum.org/EIPS/eip-6963) and leveraging [viem](https://github.com/wevm/viem) `Account` and `Transport` interfaces.
+Fully functional E2E tests for your dApp. Installs a fully operational Mock Wallet into the [Playwright](https://github.com/microsoft/playwright) Browser Context, making it discoverable through [EIP-6963](https://eips.ethereum.org/EIPS/eip-6963) and leveraging [viem](https://github.com/wevm/viem) `Account` and `Transport` interfaces, so you can completely customize the behavior.
 
 ## Quickstart
 ```ts
@@ -22,5 +22,7 @@ test("Your Test", async ({ page }) => {
 });
 ```
 
-Please note! This will execute actual transactions on the blockchain using the Private Key. You can use a [Custom Transport](https://viem.sh/docs/clients/transports/custom.html) to intercept the behavior.
+Please note! This will execute actual transactions on the blockchain without user intervention using the Private Key. You can use a [Custom Transport](https://viem.sh/docs/clients/transports/custom.html) to intercept the behavior.
 
+## Rationale
+Why not do E2E testing with actual Browser Wallets, like Metamask? Well, you should be testing your dApp, not the implementation of a Browser Wallet. Experience shows, that E2E tests using Browser Wallets are much more flaky and unreliable.