I would love to have the older iTunes back, I miss storing my ios app on my computer, see all my ringtones.Don't install if you're running an old iTunes version! (I do btw.) Especially version 12.6.5 where you have access to the iOS App Store. According to German online magazine Mac&i/Heise it won't work any more under Mojave!
https://www.heise.de/mac-and-i/meldung/macOS-Mojave-Update-Warnungen-von-Entwicklern-4171776.html
Other software needs updates, p.e. Cubase by Steinberg. There are problems with other audio software as well.