Well, that’s a very consumeristic point of view. You like LibreOffice because it is free. You can’t tell the difference between home-churned butter or store-bought.
LibreOffice represents a monumental engineering task that has gone for 25 years or so, in an effort to gain feature parity and competition with Microsoft Office. And still the battle continues. You may not know that the .DOCX format files (and the other ones ending in X) follow the open XML format, which Microsoft adopted to supplant its really horrible proprietary format. Of course, LibreOffice proposes the .ODT and family, OpenDocument formats which double down on open standards.
You may have noticed that you are using a website on the Internet. The reason you can do this is because open standards won a few key, ancient battles. For a while it looked like Novell might have a lock on IPX/SPX, but they eventually embraced TCP/IP, as Microsoft jettisoned (sorta) NetBIOS for the same. There isn’t a layer of networking that doesn’t use open standards of some kind, so the next time you want to see the difference between open and proprietary standards, take away the Internet, replace it with something vendors were never able to build, and there you have it.
Here’s the proprietary version for you: Land O’Lakes owns all the cows and all the pastures. Land O’Lakes sells butter in Land O’Lakes stores only. The butter can only be stored in Land O’Lakes refrigerators, and will not melt unless it is in a Land O’Lakes skillet. Yum!