IE will still be around until 2029, except you need to use IE mode within Edge, there are a number of legacy apps like SharePoint 2013 which are EOL next year, that still require activex components, in IE mode, Edge just embeds the window. Several years ago I wrote an Outlook signature tool, which uses the IE UDF for previewing the users signature within a custom GUI prior to creating the signature, had hoped that the tool would die with Win11 so I no longer had to support it but unfortunately it is still used company wide with both Win10 and Win11 clients.