I think the 1* and 2* tournaments should be put on ice for now.
As stated by many users allready there are a lot of reasons not to have them. The main reasons being a lack of tactical options and limited roster space ( especially given the frequency of the tournaments and limited use elsewhere ). I don’t think that this is up for debate.
For me personally the main issue is the tactical depth. 1* and 2* heroes aren’t interesting enough and lack variety. What makes this game fun is the large variety of heroes at higher levels.
I would really like to see 1 and 2* tournaments in the future but first the main issues need to be resolved :
Depth : For 1 and 2 star hero tournaments to become a thing there needs to be more variety and depth. If SG would add 1* and 2* heroes to season 2 and season 3 and give each seasonal event and other events some 1-2* heroes that bring interesting watered down mechanics to the game they could create an interesting decision space for these tournaments. Mana control, Taunt, riposte, buffs and debuffs, cleanse and dispell etc. This game is so rich in mechanics and it would be nice to see some of those at the 1 and 2* level. These heroes could be a relatively rare reward for clearing stages during the events and in season 2 maps. Just as you would find 1 and 2* heroes while clearing levels except they have a chance to be event, season etc specific.
Roster space : Given the roster space limitations it would be nice to see the roster space split up per rarity. I understand limiting how many 3,4 and 5* heroes someone can have but it would be nice if there were more space available for free specifically for 1-2heroes only. Each rarity could get a certain amount of roster space. 50 spaces for 1, 50 spaces for 2*, 40 spaces for 3*, 30 spaces for 4*, 20 spaces for 5*. Each set could be expanded through levelling and gems.
Usefulness : In order for the 1-2 star heroes to be worth levelling the need more frequent use. Events are difficult enough to complete as is so perhaps some rarity specific quests could be introduced with good rewards. A quest that can only be completed using 1* or 2* heroes etc.
I don’t dislike the idea of these tournaments but in their current state they are a waste of time, resources and space.