So, a suggestion to make it easier to collect event heroes dna would be to weekly open 1 rift event, in which each player could choose which event he’d like to play in.... So if I’d like to max Ishak, I could play those repeatedly with other players who desire the same until I could max him...

This suggestion comes from the fact that I’ve been playing the game since the start as a regular/casual player (not very competitive in events) and the highest I got a event hero is 3 stars...
And its very hard to go on since each event comes around again every 2 months or so and new events are released regularly, making it even more difficult, added to the fact that its even more dna to make it to the next stars (90 / 130 dnas).
Until a hero is 5 stars its no use, unfortunately (my 4 star Maria is worse than 5 star Luciano, for example).