http://www.wizards.com/magic/magazin...c-mtgrss#77755

You have to hit Transform to read Hill's commentary, but in particular his take on Delver of Secrets reads quite unlike anything LaPille would have said:

This little guy has been tearing up Legacy as of late, and made a decent name for itself last week at the World Championships as well. Its stats are certainly generous: you get a full three mana off your Moon Heron if all goes right, and can start attacking as soon as the second turn. Cards like Brainstorm and Ponder allow you to manipulate the top card of your library and flip this guy much more frequently than would ordinarily be the case. So how did we allow this to see print?

What we found was that in Limited it tended to flip so infrequently that oftentimes including it in your deck was actually a liability. After all, no one is scrambling to cram Fugitive Wizard in their 40-card decks. Occasionally it'd come out early and turn the game around, but when that happens rarely enough it's a fun moment. What you don't want is for the format to start revolving around a random effect like that. Later on in the game the Delver is such a poor topdeck that we felt like printing it with these stats added texture to the Limited environment.

In Standard, although it's correspondingly easier to transform Delver of Secrets into Insectile Aberration than in an average Limited game, it's also far easier for opposing decks to recover from the tempo advantage an early 3/2 flier provides. Enough decks have to be concerned with killing early creatures that the size advantage relative to other creatures of comparable cost becomes a mild upside, not a back-breaking game-changer.

In older formats like Legacy and Modern, creature removal spells are proportionally less powerful because the diversity of viable strategies in these formats renders removal more of a liability in creature-light matchups. It therefore becomes easier for a card like Insectile Aberration to take over a game—particularly when there are so many efficient ways to protect it, and when cards like Brainstorm virtually guarantee an early transformation. Fortunately, these formats tend to be robust enough to adapt to a creature that, for all its power, simply attacks and blocks.
Imagine that, a columnist who thinks that a format representing 20 years of cards might be able to handle a 3/2 flyer (or more abstractly, that generally Vintage/Legacy are better at self-correcting than smaller formats).

I don't necessarily like what Delver of Secrets represents, inasmuch as it's an efficient weenie flyer in goddamned Blue, precisely the color with the (ideally) weakest weenie dudes. Still, you have to admire someone who's publicly calling Legacy out for being robust enough to deal with one more guy that just attacks and blocks. It's almost like he trusts the players to use the tools at their disposal to think of a Good Answer to a threat. Holy shit.