Fewer mythics and rares means they typically have a higher value
Billy Norrby The Feast of Hemlock Vale Campaign Expansion #195
Not many monsters can get over 3000 ATK, let alone 5000
Beyond the Pendulum comes in very handy in these niche situations by fetching a missing scale or Vortex Combo setup piece, but the card is not always safe to use due to voiding all Counters on Scales until a Pendulum Summon is conducted, which is why it's often more of a band-aid for fixing bad hands rather than a regular occurrence
However, being featured here more than makes up for that absence
He could attack, block, had evasion, couldn't be killed, and after the Sixth Edition rules changes could attack, kill and live, and block, kill and live