The premise of a fork like this is retarded. By that, I mean why develop really great dampers like the RC2, then go backwards by making it ineffective with such things as lockouts?
1. The 66 does not have a lockout. No idea what the 55 with its 50 damper types has at this point, but the comparable RC3 does not. ETA does not count as a lockout, as it's a lockdown climb assist with some bit of travel.
2. The Lyrik does not have a lockout, neither does the Totem.
3. The Wotan does not have a lockout. It has a travel adjust as a climbing assist.
4. Manitou doesn't have a lockout.
So in going with this, I don't know why you're saying "others have it". It's not a nice feature on a fork like this and it has actually been addressed, at length, about what are the advantages and disadvantages. First thing, Zoke was guilty with their early TST dampers of enticing the xc guys over to terrible performing, QR equipped long travel forks with such things as the AM1, which had a lockout. Those who actually ride and use their suspension realize that the suspension is not only a device for going down, but can assist going up, and if the problem is that you need a lockout on a fire or paved road, I would have to suggest the problem isn't with the lack of a lockout on your equipment.
Now I'm linking to a previous thread about forks and lockouts, turned debate, and into the realm of technique. If you're interested, it's worth a read instead of a rehash of this topic, which was pretty much put to rest in 2003:
http://forums.mtbr.com/showthread.php?t=443923&highlight=lockout+jerk_chicken