update

docs/pico_hid.md

@@ -121,7 +121,16 @@ If you are making the Pico HID for V2 or V3, add the following lines to the PiKV
 ## Arduino HID replacement
 
 !!! note
-    This section is intended for advanced users of legacy PiKVM V0 & Arduino HID
+    This section is intended for advanced users of the **legacy** PiKVM V0 with Arduino HID
+
+!!! tip
+    It may seem tempting, but **don't try to use Arduino for new PiKVM builds**
+    just because you have it at your fingertips. Connecting and flashing the Arduino
+    is much more time consuming than Pico. In addition, different Arduino board works
+    with different voltages, may or may not have SPI (for Pico, we use SPI to free up
+    the UART on Raspberry Pi for the console and other useful things), etc.
+
+    Using the Pico HID is the recommended fast and standard way in the PiKVM world.
 
 The Pico HID can be used to replace the [legacy Arduino HID](arduino_hid.md) in DIY PiKVM V0 builds.
 Moreover, it can use both Serial (UART) port and SPI. The connection scheme is also noticeably simplified,