I do not think its even that, The BT certification you mention mainly deals with what hardware capabilities the device should have, the asus meets and even exceeds everything in that spec. Its more software which is the issue.
This is NOT just an issue with the Asus ive yet to see a single third party device give lower error related figures CONSISTENTLY than the standalone Huawei and ECI boxes do, and that is due to software on them.
Its certainly not the hardware to blame as such, as for example the TP-Link W9980 has basically the exact same chipset as the ECI modems and Home Hub 5 (IE Lantiq), error related figures on it are still higher though, again due to differing software/firmware. Likewise (I think im right on this) the Billions and other makes have a broadcom chipset like the Huawei modem and again they for many still report higher errors etc, obviously not always the case and will vary but has happened with those devices also.
The Asus just seems to be worse for some people, could be because its an untested chipset but i think its clear just from this thread most issues are SOFTWARE not HARDWARE. Id even guess people which can not even get a full day worth of sync from the Asus would still have issues with other third part gear just maybe not as bad, which is irrelevant really as something is either stable or it isnt. No point IMO going to a device that loses sync say every 72 hours instead of 24. For people like that i guess for now the Huawei/ECI/HH5 is the only thing they should be using if they want top speeds in addition to reliability.
Submitting x companies device for BT certification would not help from what i can see as many would meet the hardware requirements that SIN spec lays out, many devices now exceed it. The issue is the software third party companies are loading onto the devices, third party software is design for a worldwide audience not just a couple of million UK FTTC users, unlike BTs boxes.
No doubt in time a gem of a third party device will appear but VDSL take up is still so slow even after the near 5 years its been out that many third parties are just not bothering too much. You have something like 5 Million FTTC users in the UK and something like 20 Million still on ADSL (those are rough approximations) if you were a business building modems who would you still go after? Id rather sell to potential tens of millions, than single digits
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Its the same for most of Europe ADSL still being the most used, gonna be a while before it isn't.