Agree that the DDs are wasted, I have ever waited for 25 minutes
for 88 on a weekend only to have a full SD arrive.
And I know there are many SBST services, not just 88. 2 other
very good examples are 161 and 168.
U miss out 89 that also got massive downsize during weekends as
well.
161 is another service that is a headache during
Sundays/PH. Recently, even Sat also had massive downsize.
The last thing that I want to see on 161 during weekends is a
DM3500 being deployed.
168 is not much of an issue, there are still majority DDs seen
on a regular weekend basis.