I like Evelyn and Trennt's programs this year, particularly the FS. However, I've joined the club that worries if their small height difference is holding them back. I'm not saying it's impossible, but it's much harder to execute a high twist and good-quality throw jumps when partners are close in size. For example, if the girl can't get high enough on the throw, she won't be able to make the rotation and she's more likely to fall. I love them and wish them the best, but I wonder if that is why they are struggling. Hopefully they can get it together on the Grand Prix, because I would love to see their programs clean.
I think many of us figure skating fans often get too wound up about lack of height differences.

Sure we notice it visually, but physical drawbacks and disadvantages can be overcome by two pairs partners if they work together and have great desire to succeed together. I was just discussing this phenomenon in the general pairs thread in Trash Can, about Duhamel/Radford. D/R were not a great physical match because of the huge difference in their heights. But they made it work because they had so many other things in common, including a deep spiritual bond, which they have both previously discussed in interviews.
Every team is different, thus every pairs teams' journeys together will be different. In the case of Trennt and Evelyn, sure the height similarity can be distracting, and it's possible they have more difficulty on lifts and throws as a result. However, there are ways of overcoming such drawbacks. I would cite Cain-Gribble/LeDuc as one example of a pairs team who are close in height, and still successful. Ash has spoken about how people reference the close height issue as a drawback for her and Timothy. But they and their coaches don't seem to see it as a drawback. They apparently view it as an advantage. Yes, they had to find ways to adjust on lifts and throws, but they've managed to do so by working together, and also through gaining coaching assistance and advice from Nina Mozer who has another successsful, tall pairs team: Zabiako/Enbert. C-G/LD make their similar height and long lines work for them on the ice in unique, distinctive ways.
What I observe in Evelyn & Trennt is competitive grit and a similar desire to succeed. They also get along well together and with their coach. That's a good foundation to build upon, in the absence of any particular amazing pairs weapons in their arsenal. E&T don't get a lot of pop on most of their elements and they haven't started out the season very consistently, but that's not an indication of where they will end up.

Their programs are okay this season, and maybe they can make them better over time. Right now, their programs aren't especially setting the rink on fire.
The thing for E&T is that they are similar in height to each other, but they are not as tall as Z/E or C-G/LD. Moreover, E&T do not have similar body lines, thus the height difference combined with slight differences in body lines is somewhat of a challenge for them in finding ways to make an impact together on the ice. They have so far overcome these slight physical drawbacks by working well together, and being for the most part consistent competitively when it has mattered. I think their biggest challenge is continuing to grow together and above all finding a unique style that can set them apart. As I said, currently they seem to be exploring different inspirations, but I haven't yet seen them find a vehicle which truly expresses who they are individually and as a team. But that's always the key factor which is hard for every team to discover. Partnering together is all about going on that journey of discovery. For me, that's part of what makes pairs skating so exciting.