But aren’t those kinds of tournaments even much more unfair for newer players and casual players?
Who has five strong heroes of the same class or same colour in a given rarity? Very advanced players and P2W. Beginners and even intermediates would be even more frustrated than in 5* mana rush tournaments (where they can at least use their best heroes even if the best are 2* and 3*)
Moreover, mono tourneys would be a complete lottery without much strategy involved. Be-colour would be a bit better. Tri-colour (only red/green/blue) would, however, be a possibility.
3* Atlantis heroes are very easy to get, even for F2P, as playing Atlantis map gives lots of free Atlantis coins. As for 3* event heroes, I have to agree, most F2P will get none or very few of them. However, while they are nice to have, they are not necessary to be competitive.
Vanilla 3* heroes like Brienne, Gunnar, Kailani are awesome for all types of 3* tournaments. For mana rush Jahangir and Ulmer are beasts. Even Oberon is said to be great. Gunnar is among the best tanks for mana rush.
There is simply no need for extra 1* content and little need for 2* content. In order to reach province 15 and unlock Atlantis map, you need 3* heroes on your team and usually also have TC 12 or 13 to get you a continuous stream of 3* heroes (and a few lucky 4* from TC 13). True, already maxed 2* are still somewhat useful at this point but 1* heroes simply get crushed in S1 P15+ and S2.
Therefore, if 1* heroes are by far to weak in map levels, why should there be Atlantis 1*? For tournaments that pop up twice a year or so? A complete waste of resources.
2* heroes might survive in the first few Atlantis stages, but the increasing difficulty level makes them obsolete relatively soon. So why bother with starting new 2* heroes when you can already train 3* heroes and even get your first few Atlantis 3* from the free Atlantis coins?
To use them in tournaments that show up once in a blue moon?
There are a lot of much more interesting things, developers now have to focus on (more costumes, S3, Hero Academy,…) than creating new heroes that would have little use in almost all aspects of our game.