This is so that you have over half the card to grab onto to pull it out easily
Proposal You may notice a trend here: When Richard Garfield planned to propose to his then-girlfriend, Lily Wu, he wanted to do something special
When that spell or ability resolves, Glen Elendra's Answer won't be countered, but any additional effects of the countering spell or ability will still happen

Aardwolf's Advantage Abandon the Post Acceptable Losses Acidic Soil Act of Treason Act on Impulse Aftershock Agate Assault Alchemist's Gambit Alchemist's Greeting Allure of the Unknown Alpha Brawl Amped Up Anarchy Ancestral Anger Angelfire Ignition Anger of the Gods Angrath's Fury Angrath's Rampage Anzrag's Rampage Apex of Power Apocalypse Arc Blade Arc Lightning Arc Trail Archaic's Agony Armed // Dangerous Arrow Storm Art Appreciation Artistic Process Asgardian Inspiration Assault // Battery Assault Strobe Assault on Osgiliath Avacyn's Judgment Avalanche Avengers Disassembled Awaken the Blood Avatar Awaken the Sleeper Awe for the Guilds Banefire Barrage of Boulders Bathe in Dragonfire Beacon Bolt Beastie Beatdown Become Brutes Begin the Invasion Bend or Break Besmirch Bionic Blow Blasphemous Act Blast of Genius Blaze Blazing Volley Blightning Blinding Flare Blood Feud Bloodsoaked Insight Bloody Betrayal Blow Your House Down Boiling Earth Boiling Seas Bolt of Keranos Boltwave Bond of Passion Bonfire of the Damned Bonus Round Book Burning Boom // Bust Borrowed Knowledge Bot Bashing Time

Pied Piper of Hamelin Black/Red Rat Token Aggro
As such, card draw, removal, and two-for-ones are the name of the game