Is that due to lack of information from OpenReach until an incident is raised, or ISPs not wanting to provide granular status information to customer?
Because if an issue is only affecting a single card in a single DSLAM, 48 customers maximum, many of which may not even be Sky customers, the status page would be dozens of entries long. For Sky to actively monitor these outages would also be counter productive.
When Openreach pick up an issue on their network, as they often do before the customer or the ISP realise they'll flag the fault on their own systems.
To give you an example, these are the 'Matters Beyond Our Reasonable Control' lists on the first page of the openreach website. It's very unlikely any of these would appear on an ISP's status page. These MBORC's are generally due to hamfisted digger drivers, incorrect information on openreach Databases (nah mate, that cable's not in use, pull it out') and simple age/weather related damage:
various Belfast, Province - repair 18/10/2017, 23:59
TIMBERSCOMBE TA24 7DT CP4 OFF DP89 ON THE B3224 18/10/2017, 15:45 25/10/2017
DRINGHOUSES FRAC 113549 YO242QA Marsh farm, Dringhouses 16/10/2017, 14:00 16/10/2017
Wombourne WV50AQ O/S Waggon & Horses Pub, Wombourne. 13/10/2017, 12:30 14/10/2017
NANTYDERRY NP151JN PCP8 BETTWS NEWYDD 12/10/2017, 16:00 19/10/2017
Muswell Hill N10 3HU Muswell Hill London 11/10/2017, 15:00 11/10/2017
HUNTINGDON PE28 4PF HUNTINGDON 12/10/2017, 16:06 16/10/2017
RHAYADER ld6 5dr RHAYADER 12/10/2017, 12:00 13/10/2017
WALWORTH SE24 0QQ NEW RBS6102 CAB/CAB SWAP 108 SHAKESPEARE ROAD LONDON 10/10/2017, 09:00 20/10/2017
GLENBOIG G69 0HQ CHRYSTON,GLASGOW 12/10/2017, 14:38 16/10/2017
The first date is the reported time, the second is the estimated repair time. Some of them are closed, others are not. To use the second top, Timberscombe, the report says: MBORC Description: POLE SMASH, CABLES HAVE BEEN RIPPED OFF AND CUT IN HALF. This pole, if it's the end of the line may only support 10-20 customers. although possibly more if it's further up the chain, but likely less than 150-200 customers across all ISP's. This wouldn't really appear on a status page but would flag up if an ISP were to run a test on the line. For Fibre this would flag up as 'DT, Service found to be part of an existing network event'. In other words Openreach know it's down and are working to resolve.
Another example:
BRACKNELL 51 03/10/2017 We are working to rejoin cables 20/10/2017
That's 51 'Trouble Reports' (what Openreach call a fault) for a cable break. Sure, it's likely a few more people have been cut off due to this and haven't yet reported the fault, but out of Sky's 5 million broadband customers, is putting a fault that could only be affecting 15-20 customers, less than 0.001% of Sky broadband customers on the status page worth it? I'm sure you'll agree, probably not.