Thankfully we have already made good progress towards things like arm memory tagging and memory safe languages.
It’s a rocky period right now but the future will be much more secure after all the low hanging fruit are found.
That's definitely an improvement, but it's just one aspect of cybersecurity. Logical errors allowing people to e.g. log into services and extract data are likely everywhere still.
How many devices/operating systems even use memory tagging? iOS, macOS and GrapheneOS, I think that's it? And iOS/macOS only use it for the kernel, a subset of system processes, and I think applications can opt in to it.
Heck, Google may have even hampered MTE in Pixel 11 (since support has been disabled) and Snapdragon 8 Gen 5 only got basic support.
We are moving way to slowly adopting hardware mitigations and memory-safe languages.
There's still no x86_64 processors on the market with MTE and it was only recently standardised between Intel and AMD. It's going to be 10+ years before memory tagging is widespread on desktop, and 5 years for Android/iOS devices.