There are various reasons why one does not immediately improve pages to meet certain standards, or even to prevent deletion. If an editor states an intention to make an improvement that will take more time, this should be respected.
Sometimes, an improvement will require time to find information on the topic. This may include finding and studying books, newspapers, journals, or web sites, choosing the most appropriate ones, or summarizing in encyclopedic form. Rome was not built in a day. Neither is Wikipedia.
Some people may be dedicated to Wikipedia as their number one cause in life. However, most editors are not. Editing Wikipedia is usually more in the nature of a hobby, which ranks in personal importance behind editors' personal lives and (usually) their employment.
Because Wikipedia is completely voluntary, under no circumstances are editors obligated or expected to make any edits, respond to any messages, or to otherwise have any involvement. Please don't presume that if a fellow editor has not responded to your message that you have offended them or that they are insulting you: assume good faith and remember that life might have gotten complicated and by drawing negative inferences from their lack of editing you might be making it less attractive for them to productively contribute to the project in the future.
Editing Wikipedia is often one among many hobbies. An editor may spend months playing video games, hiking, reading, visiting friends, or watching the grass grow. They may show up to edit Wikipedia whenever they feel like it.