I agree with GlynG, in the abstract, if not necessarily the particulars.
The door is (and has been, based on many of the existing lists) open for War Engines at fairly arbitrary DC values. DC1 is the only remotely questionable usage, as currently it's only used in a few lists (Experimental Harkoni Warhawks and Developmental Hyperion Knights). The rules handle the concept just fine, and the only areas a DC1 War Engine differs from an AV are in its ability to Barge during an assault, which honestly seems pretty appropriate for most of the units we're talking about, and the ability to allocate shooting to it in a mixed WE/non-WE formation, which again seems appropriate as most of these units are sufficiently larger than a normal vehicle to be easily picked out in battlefield conditions.
I think a lot of it depends on the background of unit and the design intent of the unit within the army. DC, like most Epic stats, is arbitrary and a bit abstract. Some units are especially powerful for their size, others particularly fragile for the same, because they have different battlefield roles. A Tau Orca is bigger than an Eldar Cobra, but it's primarily a dropship and transport, not a battle tank, so being DC2 instead of DC3 makes sense.
The Grey Knight Dreadknight or Ork MegaDread is pretty much what I'd consider a DC1 WE in Epic terms. It's large enough that I can see it qualifying for the WE abilities to barge things out of the way during assaults, and to be large enough that picking it out among a formation of say, infantry and transports, would be possible at long range. The Riptide is a bit larger and definitely bulkier, and straddles the DC1 to DC2 border for me; I think Tastyfish suggested "DC1.5", but the rules don't support that well and I think it's just bulky and armored enough to round up rather than down. If it were built more like a classic Crisis Suit or the FW Hazard suits, or had lesser armor or wounds in 40k, I might be inclined to round down. The Wraithknight is pretty clearly into DC2 territory in my mind, both by size and being T8 in 40k.
Roughly, I'd say anything which completely fills one of the oval flyer bases at 40k scale as a walker/creature is probably into WE territory. For more traditional vehicles, I'd probably use the Land Raider as my boundary. Anything larger is a WE, anything smaller is probably just an AV. Having particularly good defensive stats (T6 or better with more than 4 wounds, and a 3+ or better save of some sort) would push me towards WE status, and for things that are on that border between DC1 and DC2, push me towards the higher end (For instance, in the Riptide's case, it's "only" 5 wounds at T6, but it does have a 2+ armor save and a 5++ invul save which can be upgraded to 3++ on demand).
On the other hand, if the stats aren't particularly strong, then even larger vehicles/creatures might not qualify for WE status. A Valkyrie is pretty clearly bigger than a Land Raider, but in 40k Terms it's got fewer HP and lower armor all around, and as a flyer it's more vulnerable as disrupting its mobility means falling from the sky instead of just grinding to a halt. Nor does its battlefield role tend to cause it be pushing units out of the way. So, ultimately, I don't think anyone really would disagree that it should remain an AV and not become a WE.
I think there are a fair number of units that are currently AV that could probably stand to be upgraded to DC1 or even DC2 War Engines, with appropriate changes in costing. Slaanesh Knights and Ork Stompas both are on that list for me.
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