Yes, the new struggles will be equal you could say. However, most (not all) players will struggle mightily with 600-700 tp difference in war and get frustrated. Some already have that on later hits. I’m currently in an alliance around 600, most of our players have later hits in the 3.8-4k range and do have to hit 4.5-4.7k full teams with those flags. Now extrapolate that downward to lower alliances. The items are scarce but like 4 star mats will periodically be guaranteed for active players. So it is entirely feasible that players who are still using 3s or 3-60 4s in war could have, and have to face 4.8-4.9k defenses or even higher. This, while equal, will frustrate many. Basically the defenses will dramatically outpace the offensive options at least for war.
Emblems were a periodic gain. You got a few ranger emblems you bumped Lianna from +2 to +3 or whatever. The stat gain was incremental not a giant jump all at once. Emblems could also be swapped later, and more spread out. The breakers in testing could not be reset.
It will hurt hero diversity, assuming you want use the best teams you possibly can the majority of the time. If I remember correctly you do compete in tournaments. How often do you use no emblems 3/4s there when you have a comparable options at +18-20? It certainly can be done, but it’s not optimal. My point here being that in tournaments it will be very hard to consistently use just regular maxed 3s for example, because if facing a limit broken +20 it basically the power of a 4. This is admittedly subjective as a downside, but it would nice not to have to take a hero to +20 or limit break them to adequately try them out.
Basically, it could be done better. There is no need for a new item. The levels could be unlocked instantly or with the 100k useless items we already have. It puts artificial barriers in place when the grind is already becoming too much for some. It further stretches the food resource without more advanced farms being added. Literally dozens of suggestion to improve this feature in testing were ignored. These reasons, and dozens of others, are why people are frustrated with this proposed feature. Last test cycle I think 37 people were against, 2 for the feature being added, of those who commented. It’s brutal, even for the “I like a challenge” type. It’s a bigger bump up then it seems I guess I’m saying. Yes it is “temporary” but that period will last a long time, at least a year or two baring a change in how they are acquired.