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I'm testing to see how old versions of Messages would run in new versions of macOS, and to get the apps to function, I would need the proper frameworks from the same version. I got my hands on the Messages beta installer for 10.7 Lion to see what frameworks it needs to install and use to function, and I need to know if replacing, modifying or deleting any of these frameworks will cause major system instability or break core system functions. I don't count iMessage or FaceTime as core system functions, so if replacing these will break FT, I won't mind. 32-bit compatibility is also not a problem, since I am running Mojave. Here are the following frameworks/files I intend to replace or install: /Applications/Messages.app /System/Library/Spotlight/Chat.mdimporter /System/Library/PrivateFrameworks/XMPPCore.framework /System/Library/PrivateFrameworks/PhoneNumbers.framework /System/Library/PrivateFrameworks/MMCSServices.framework /System/Library/PrivateFrameworks/MessageProtection.framework /System/Library/PrivateFrameworks/Marco.framework /System/Library/PrivateFrameworks/IMCore.framework /System/Library/PrivateFrameworks/IMAVCore.framework /System/Library/PrivateFrameworks/FTServices.framework /System/Library/PrivateFrameworks/FTServices.framework /System/Library/InternetAccounts/iChat.iaplugin /System/Library/Frameworks/InstantMessage.framework /System/Library/Frameworks/IMServicePlugIn.framework /System/Library/Frameworks/IMCore.framework (alias) /System/Library/CoreServices/Menu Extras/iChat.menu /Library/Scripts/iChat/Mix Message Case.applescript /Library/Scripts/iChat/iTunes Remote Control.applescript /Library/Scripts/iChat/Auto Decline.applescript /Library/Scripts/iChat/Auto Accept.applescript /Library/iChat/PlugIns/Yahoo.imserviceplugin

i just installed an iOS 14 simulator, and in the window, it clearly states the size of the sim is 4.9GB. however, after installing, over 14GB of space has just vanished. after some time, it coughed up about 6GB, but it is still too big. why has so much of my space suddenly vanished after installing the simulator? can i free some space without uninstalling the simulator completely?

is there an actual way to mount the system volume as r/w? method described here - https://developer.apple.com/forums/thread/649832?answerId=614524022#614524022 doesn't actually give r/w access, and requires a restart. sometimes i like to make quick mods to the system, and a restart is unconventional. plus, an app i carried over from my catalina install that i no longer need, managed to get into the system volume, and now i can't delete it. is there a better way?