I remember "right clicking" with a long press back on Windows CE and Windows XP Tablets. If you had experienced this era of mobile devices, it is natural.
How to delete an app? Right click on the icon, delete. Kind of the same action on iOS as on Windows 95.
I just tried this on iPadOS. It’s not quite as simple as you suggest; the steps are:
1. Hold down (long press? 3D Touch? I’ve never quite understood the difference) on the icon until a context menu appears. This is analogous to right-click.
2. Select “Rearrange Apps” from the menu - you need to know/guess that deleting is a sub-action of rearranging.
3. Click the familiar close icon that now appears.
Step 2. is the new one, and it introduces quite a lot of friction.
On the other side of the analogy, I think there was an easier (more discoverable) alternative to the right-click in win95 - certainly OSX - which was to drag the application to the recycle bin / trashcan.
How to delete an app? Right click on the icon, delete. Kind of the same action on iOS as on Windows 95.