The Bx19 is getting changes. They are removing redundant stops. The features that would help improve performance for the Bx19 are:
-Bus lanes on 149th Stthroughout and Southern Blvdparticularly around East 163rd and Westchester Avenue.
-All door boarding
-Off board payment
-OMNY (off board tap for mostand inside tap for people running in last minute)
-Traffic signal priority.
The route is already prettystraight.
Some of the things you mention are already in the works. Instead of complaining, take the time to read the Better Buses Action Plan. It describes in detail a number of corridors that are being worked on by the DOT and the City, and include things like bus lanes, Transit Signal Priority and so on. OMNY should be on all buses Citywide by sometime in 2020. Until then people will have to be patient and wait. What is concerning isn't what they're doing, but rather what isn't being done, and how long some of these things have been in the works.
https://www1.nyc.gov/html/brt/downloads/pdf/better-buses-action-plan-2019.pdf
Why are they doing it like SBS?