Microsoft is changing its upgrade strategy, this change affects the semi-annual feature upgrades. The first steps in this direction have already been a bit earlier, in 2018 Microsoft has announced the fall release to provide 30 months of support. This also makes sense under the new strategy.
Along with the further step, elimination of the “Semi-Annual Channel-Targeted (SAC-T)”. The “Semi-Annual Channel (SAC)” and the “Semi-Annual Channel-Targeted (SAC-T)” had inherited the two branches “Current Branch (CB)” and the “Current Branch for Business (CCB)” and were their replacements.