Because 1.2.1 is the last simple version . It was the version right before the combat update changed everything. Right before hunger became too complex. Right before the world height doubled.
A: No. Eaglercraft 1.2.1 cannot connect to official Mojang servers. You must use specific Eaglercraft servers that run a special proxy. However, your friends can also open the same HTML file on their computers and join your LAN IP. eaglercraft 121
have introduced cleaner UI layouts and organized pause menus, which have been mirrored in several Eaglercraft distributions. Version Roadmap & Compatibility 1.21.x Transitions EagleRCraft 121 — Complete Guide, Review, and Setup
The screen flickered. Usually, this was the moment the "Access Denied - Reason: Gaming" screen appeared, a giant red stop sign mocking his rebellion. Right before the world height doubled