Time and money are fungible resources what costs one costs the other. The 4 steps so described are only as described if one insists both on using a separate device which you happen to already own vs your perfectly capable smartphone and in ignoring possible optimizations. They are also oddly thought out wherein the entire process of shopping for a book to read which may take tens of minutes and involve reading reviews or snippets of a book and which will certainly be completely unusable on your kindle is considered 1 step but so is the act of actuating a single button.

It's also probably wrong to list converting to a kindle compatible format and copying to your kindle as 2 separate operations when one in fact can perform them both by clicking one button or indeed avoid conversion altogether by downloading the appropriate format.

For your consideration.

1. Spend time on your computer/smartphone/in person discovering interesting things to read.

2. Open up your store app/website/device, navigate to the desired book, buy, and download it.

vs

1. Spend time on your computer/smartphone/in person discovering interesting things to read.

2. Open up zlibrary/libgen navigate to the desired book and download it.

vs

1. Spend time on your computer/smartphone/in person discovering interesting things to read.

2. Open up zlibrary/libgen navigate to the desired book and download it.

3. Import into calibre and either automatically convert on import or have it automatically converted when you click send to device

vs

1. Spend time on your computer/smartphone/in person discovering interesting things to read.

2. Open up zlibrary/libgen navigate to the desired book and download it to a folder which is watched by calibre whereupon it will automatically import, convert, and email it to your kindle in the correct format.

This isn't twice as hard and it buys you a copy of your ebook on your computer and device which can be backed up with the rest of your files and which will never stop working because someone else says so. It's also trivial to share with anyone you like just as easily as you can add to your own device. You also get a great search experience on your computer and on your phone if you use calibre companion which incidentally you can use to wirelessly send to your non kindle device.