if it is more complicated to delete, it would be sufficient to save the selected pages. :)
Windows has several built in PDF Editors within MS Edge one is based on Foxit code and about to be enhanced to be replaced by "Powered by Acrobat". The effect of deleting a page in a PDF without using a full editor like Foxit Pro or Acrobat Pro is "collateral damage" to bookmarks, forms and annotations Thus NOT a simple lighter browsers editor task. You will not see that ability in Edge or Firefox without losses of PDF features. IF you are not concerned about such losses then very simply open a PDF in Edge and ensure it is set to "Save to PDF" then select the pages to keep and exclude those unwanted. So if you want even pages from an 8 page PDF simply use 2,4,6,8 and only those pages will be saved. Similar to save first 2 and last 2 use `1-2,7-8` and save the reduced PDF
I support it, it's a feature that shouldn't be complicated. I also want to make it easy to edit pdf bookmarks, as some scanned documents require manual markup
btw.. it exist not only pdf.. fast removal of pages are an interessted function for comicbooks too (for exsample delete of advertisment images in cbr/cbz/cb7 archives)