One fact everyone should know is that new players join CONTINUOUSLY. Simply decreasing the difficulty or amount of time required does no help for a player joining during the last few weeks of nightwave, and more frustrating feelings would come along.
Just two points, I don't know if the devs already come out with any of these(would be grateful):
1.Since a catch-up function will be added, why not just stretch it further and make awards from previous series accessible(after reaching lv30 in the present series)? This would send a good message to all new players - as long as you try hard enough to catch up you'll eventually get all nightwave awards everyone else already own.
2.PLEASE DO bring the old alert system back during the downtime. It would be great if downtimes keep exisitng between future series and bring the old alert system back shortly. There's one particular reason: the alert weapons. 8 out of 9 can't even be purchased from store, and each one costs 50 nightwave credits, meaning you have to give up 16.67 Nitain Extracts or 2.5 Aura mods for each. It would be good if you already gain, like, 70% or 80% of them, and don't feel like sitting in front of the screen waiting for alerts all the time, but for new players that's definitly horrible. Gaining 50 credits costs merely a week, and I don't think you won't come into any of these weapon alerts during time cost doing nightwave weeklies, not to say you won't be able to get nitains, helms, auras, anything, just a weapon. But with a downtime giving easier access to players not owning any expensive nightwave shop items, The whole nightwave system would be friendly and helpful.