- 21.7 in x 71 pixels per inch is also 3000 pixels.
The only thing which is important is the pixels count. You can print or display as big as you want from the same image, that does not change the pixels count and the details level in your file. The so-called 'ppi' is only a tagtelling you the physical size you'll get in two different cases:
- you want to print
- you want to display on a screen.
The 300 ppi resolution means you'll get a very detailed 4 x 6 print.
For big prints A4, A3 and more, 200 ppi will be good enough at normal viewing distance.
The 72 ppi resolution was good for very old displays with about 72 pixels (photo sites) per inch. Today's screen are rather in the 90 to 200 ppi, so that indication does not help much.
It is interesting that when I used Adobe Bridge 2022 for batch conversions for sets containing over a hundred files, it crashed each time, just after four sets. where else the batch conversion in Photoshop Element carried on fine.