It seems to be the modern way, and normal on mobile apps, and I can't stand it. Why would I want the computer to save what I wrote without asking? I like being asked. I dislike computers trying to be clever.
I had to complete a resiliency test on our infrastructure and submit it to auditors for compliance reasons. I ran the tests, got the results, and I have to put it into a report. The report is like 30 pages long or more, but very little changes between each test (we do them quarterly). So I only usually change a few tables with the new report results, and freeflow some commentary in the discussion section that is unique for that run, so that the auditor feels special.
Anyway, I open up the previous quarter's report. I edit a bunch of data, write a bunch of useless commentary and go to "Save As" with the Q1-2024 suffix, and I realize the Word document had been autosaving my work the whole time on top of the Q4-2023 report. Urgh, very annoying. I didn't save intentionally because I knew I would save a copy later.
I was able to restore the old version through revision history, but still annoying nonetheless.
If the intent is to not overwrite an existing file, I personally learned to make a copy first either via Save As in the program or by copying in whatever file manager I'm using. That way I make my intention clear to both myself and the computer.
I've actually burned myself numerous times because occasionally I would forget to copy first, instinctively hit CTRL+S frequently because I hail from before autosaving became widespread, and then realize I just overwrote something I wanted to keep as-is.
Notepad++ just saves a cached version of the file without touching the original until you explicitly hit "Save". If you close the file in Notepad++ (not exit Notepad++, but tell Notepad++ to close the file thus deleting the cache), it will ask whether you want to save your work.