A few points:
To the person who created the display that shows up when you go to a specific tournament page: if you think that you are good at creating a user-friendly UI, you are not. The old system showed the players, standings, and tournament progress in clean displays. The new system needs improvement, as others have detailed. For example, the current "Tournament State" display is a downgrade from the old display, since it shows less of the tournament than the old one did. A good UI makes the functions users want to use usable, and has displays that are easy to navigate.
When going to the Tournament page from the "Play" pull-down menu for a specific games, don't have a "recommendation" for a Tournament that is not for the game selected prominently displayed. When I go to the tournament page for a specific game, I just want to know which tournaments FOR THAT GAME are available to sign up for, which ones are in progress, and which ones are completed. This part of the new system at least seems to work, although I liked the old system better. Having to make an extra click to see the filterable tournament page is not good. Just have the first page shown after selecting "Tournaments" from the "Play" pull-down menu simply be the filterable tournament page. Having to make an extra click to see the filterable tournament page is not good. Also, I would suggest that the default display show tournaments available to sign up for, as I would assume that what most people who go to that display are looking for.
Bring the invite function back SOON. It is a great way to get players to play in Tournaments, and to get new Tournament series started.
Whatever problems existed in the Tournament space before, did BGA ask players or tournament organizers what they thought of their proposed changes? I have created hundreds of tournaments and was blindsided with these changes. I had no problems with the previous system.
If the goal was to make tournaments easier for mobile users, please realize that this has come at the expense of PC users. Many games and information displays on BGA are not really easily played or displayed on small screens. The previous system's display of a tournament's progress worked well on a PC. That amount of information is never going to be as easily displayed on a mobile device. Making the PC display terrible for a small improvement in the display on a mobile device is a bad trade-off.