Right.
1. "All channels set to 1" is wimpy: sometimes channels are useful
2. "All channels set to a track's channel" is erroneous: sometimes a useful channel distinction has no relevant relationship to the particular interface between a midi track and an instrument, vst or hardware.
3. "Change of a channel" by bouncing is irritating, if the channel had meaning that needed to be preserved.
4. Avoiding bouncing of midi clips is dangerous, imo, though it may be a superstition. It's also a work-flow inhibitor, since now sonar prints a little "picture" at the end of every midi clip, obscuring the contents at the end in the project window .. in a large project a glance at a clip can be very informative, even in very small size, while looking at a Platinum logo has no useful purpose at all ... many clips, many Platinum logos.
5. There are only 16 possible midi channel numbers. Track counts go way higher, so there is necessary duplication if a fixed relation between track and channel is enforced (as by bounce to clips).