100% RAM is the biggest factor for Apple devices as their A and M chips are beats for CPU/GPU.
That’s why for years apple were always behind android for RAM because prior to Apple Intelligence and Liquid Glass, the OS just didn’t need as much RAM.
While I totally agree on the first sentence the issue with RAM in iPads has been there well before Apple Intelligence. And precisely because Apple has been stingy with RAM. But there have 2 kinds of issues, slowdowns and reloads.
Slowdowns started to become evident with IOS 9 with 1GB RAM iPads (all except the air 2) and 512GB ones became unusable. But slowdowns stopped being an issue until very recently, probably because the faster chips made memory compression less of an issue.
However another issues has been affecting iPads for years, reloads (except that not everyone notice them and Apple has not cared about this).
Reloads became an issue on 2GB devices since iOS 11 and things got progressively worse with iPadOS.
Then the issue moved to 3GB and 4GB devices with iPadOS 14 and 15.
Hardware wise, the first iPad pro jumped to 4GB RAM in 2015 but that remained the ceiling until 2020 with 6GB (unless you bought the 1TB 2018 pro in the meantime). With M1 there was a jump to 8GB already at the following generation in 2021 and even a 16GB option. 8GB ended the reload issues... until Apple Intellingence.
With iPadOS 18 even 8GB devices started to reload.
Reloads are not slowdowns and some people don't even realize they are due to RAM or even notice them depending on how they use the iPad, but if you take reloads into account RAM has been an issue for years and even more so than on Android. I have been using Android devices and iPads for over a decade. And while iOS does compress better than Android and some apps require less RAM (there have been tests about this), 8GB RAM on Android are still far better than 4 on iPadOS, not even close unfortunately.