Technically there are still route amendments etc under SBST/SMRT
even after BSEP as launched, such as 123 & 124 to HarbourFront,
189 to Clementi Ave 1, 92M, 181M, 99 to Joo Koon and most JIS
amendments (except 258). However I think most of them should be
initiated by LTA, with exceptions such as 92M and 181M.
There were rumors that 20 was supposed to be a non-BSEP service,
although it turned out to be BSEP in the end.
Not a rumour bro; it was a FACT.
SBST press release clearly stated a non-BSEP svc from Tampines
to CBP would be intro. Thats why I was truly surprised when I saw
20 under BSEP.