As I previously stated in my first post, I followed the Poppet instructions to the letter (as I had previously done for all the other updates, and have had zero items not still there when finished.) The keys are to back up the Beech Barron 58 and King Air 350 if you want them in v4.4, and do not do the complete uninstall, reinstall. be sure the client, content and scenery are manual and individual.
From what I gather from reading across boards is that only software that replaces textures in your sim go away, thus I uninstall and reinstall ORBX Global, Vector and the library. I also have airports HD, REX Soft Clouds, Active Sky 4 which I reinstall. If you have others that you know replaces textures in the base, reinstall them, but a I did not have to do anything else with my scenery. Because it is too lengthy I will only mention publishers of my other software. Oh, btw don't forget to update your NAVIGRAPH data as well as it is gone on installation.
1. Flightbeam
2. DreamTeam
3. ORBX
4. Other freeware and Misty
5. FSUIPC (although I did update to latest just to be up to date)
6 Virtualcol
7. Milviz
8. Coronado
9. Alabeo
10. I'm sure I left someone out, but it works.
Thanks for asking for my opinion and good luck with your update!
I forgot to answer your base question. Here is the benefit of installing the scenery portion of the the update. If it isn't important to you then don't update your scenery. I like the new stuff myself.
"Prepar3D Scenery
Fixes and Improvements
Fixed trench running through large areas in Iran.
Added several representative military jets to AI traffic. These require military cargo/combat parking spaces to appear.
Fix for specular value of bare desert that caused background globe to be brighter than generated textures.
Golf courses can be layered on top of airport backgrounds.
Added several new scenery objects including warehouses, wooden pallets, wooden shipping crates, and military tents."