My Opinion after 100+ Hours playing | Wuthering Waves 

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I've mentioned in previous videos about double XP events that my main issue with the Echo system is the experience (EXP) system, not the tuners. Once you reach a point where there are no more chests or quests, and you're stuck doing daily tasks in Tacet Fields or fighting bosses to obtain EXP jars for echoes, those resources run out quickly when trying to enhance an echo. In the end, the amount of EXP available is insufficient to upgrade echoes effectively. I am currently at Union Level 53, approaching Level 54, and the Echo EXP drops from Union Level 20 are still the same as those at Level 50. Looking ahead, I suggest implementing a system where data merges have the potential to drop Echo EXP.

@cleverfoxsol that's false. You get more echo xp at 50 compared to 20. I've got 3 built teams and am currently stockpiling Echo xp. Double echo xp events at 50 brings 3 gold tube's up to 6 for your first 3 runs of the day. Events give purple and gold tube's as well. For very little xp investment, you can level echos up to 5 and 10 to see if you have any rolls worth investing in, which will also save you a lot of xp if you're feeling a bit picky about substats.

@@lichmourne00 I must correct myself; you are right regarding upgrades increasing significantly after level 40. However, even on average, leveling an echo from 1 to 25 requires 146,000 EXP, assuming optimal tuning. On average, a Tacet Field without Double EXP drops yields 4 golden sealed tubes and 3 purple tubes, equating to 26,000 EXP per field. Given that 240 waveplates on a Tacet Field can be completed 4 times daily, this results in approximately 104,000 EXP from Tacet Field drops. This amount will only raise an echo to level 22, considering that the average player will level up multiple echoes. While I don't have an issue with the drop rate of tuners in Tacet Fields, tuning echoes to obtain desired substats comes at a significant cost. If the tuning results are unsatisfactory, you must sacrifice that echo, losing about 30% of its value when feeding it into another echo in hopes of better results. In summary, it takes two days without a double event to fully level an echo. Given the future importance of echoes, I believe the system needs re balancing to make echo enhancements more accessible for players.