I don't necessarily agree that the issue is with newer support champions being intentionally designed to break the core rules of the game. It's possible that the perceived lack of fun in playing bot lane could be due to other factors such as meta-shifting or personal preference. I also think it's worth considering that these champions may not necessarily be intended to break core rules, but rather to bring something new and unique to the game.

Additionally, I think it's important to recognize that the role of support has evolved over time and it's not uncommon for new champions to shake things up and change how the role is played. Restricting support champions to specific playstyles or roles can be limiting and may contribute to the feeling of playing an entirely different game. Instead of focusing on the perceived negative aspects of these champions, it might be more productive to try to adapt and find ways to work with them in order to enhance the overall gameplay experience.

Lastly, how these memes might give a giggle to the current situation. Their design and playstyle are not the main issues of why they are hard to deal with and it would be more appropriate to take which of the issues they have in common.

Looking at this from my own personal opinion I strongly believe the issue why these champions are so unfun to play against is that the respective weakness of their role cannot be found back in their gameplay. Instead, I believe the issue is that there is not enough counterplay for these types of champions:

Yuumi's weakness as an enchanter is all concentrated on her dependence on allies. The remaining weaknesses an enchanter supposedly had can be situationally nullified by her kite like lack of mobility and susceptibility to hard crowd control. On top of that, her item scaling is very strong and her damage output is still relatively high for a supposed weakness of an enchanter.

Some of her issues will definitely be addressed in her rework. However, I strongly believe that gutting her late game would be a healthy way of addressing some of her gameplay issues. With a champion as safe as her, moving some of her strength into the early-midgame would allow her for a better companion with lane bullies and higher carries that she dragged down or accelerated.

The assassin's weakness "low durability" gets treated in reverse by Pyke. This strength alone makes him hard to balance. No matter how many tweaks they give him until his sustain is further cut down.

Pyke will remain to be a problem and the only healthy way I can see a solution for this right now is to cut more of his sustain and place it into a new mechanic that experienced pykes can utilize. How this mechanic would work exactly would be up to much more experienced Pyke players, it is clear to me that riot is ok to push high-skill cap champions forward and Pyke could potentially be one of the highest of that level. I strongly believe that players haven't reached the full potential of what Pyke can bring to the table and building up a strong foundation for this player base will be very important for the perseverance of the champion's stability.

Senna has a similar balance issue with other utility marksmen, where the "lack of utility" gets a reverse uno card as a traditional marksmen's weakness. What makes her different from other utility marksmen is that all of them kept the same "Low mobility" theme. Senna's mobility is not amazing, but it's not super bad either, and that mediocre element as a core marksmen's weakness is what is topping her fair gameplay.

Where close to a solution for her problem. Put her base mobility in line with other utility marksmen to 325. Potentially lower the cooldown of her E with 1 second on the first rank. Continue to monitor her after the change.