Just because you personally don't like the source of the drama we're having, doesn't mean that said drama is forced.
She has been pursuing her career as an actress ever since the first few arcs of the story, it has been the major source of plot ever since they got together.
Because, yes, they got together but Yamada's career is this shadow hovering over their relationship and we can't have closure if we don't deal with it.
And there's a lot do deal with it:
Yamada's impetuous pursue of her dream versus how much she loves Ichikawa;
Ichikawa's lack of ambition being a source of insecurity for him;
The fact that Ichikawa is forcing himself to "grow up" for the sake of the relationship, because he feels it's immature to be jealous over her acting.
To put it bluntly, even if they started dating, their relationship is doomed if they both don't manage to balance things out and learn when to concede and when to establish limits with eachother.
The story is still about growing up, social anxiety and romance, Yamada's career is just one of the vehicles the story is using to communicate these topics, like was Ichikawa's desire to literally murder Yamada earlier on the story.
That's why I used "a bit" before the word forced to emphasize that I'm aware that this plotline was properly set up beforehand. What I'm arguing is, that it was a mistake to make Yamada's career this sort of "endboss" plot point, full of the typical jealousy and miscommunication trappings of more melodramatic works, that's hovering over every recent chapter of this manga.
I feel like this work did a good job of having constant little milestones in the progression of both the MCs and their relationship with each other and them tackling their weaknesses and insecurities, while still creating a comfortable slice of life reading experience for people to just relax, but the constant underlying unease this recent storyline creates is slightly poisoning the well in my opinion and we haven't seen any major development after quite a few chapters of it being introduced, there doesn't seem be an end to it in the near future.
What is the difference between this showbiz drama angle and for example setting up a plotline about Yamada having a strict family that forces her into an arranged marriage or some other dramatic filler, solely existing for conflict, that has been done a million times by lesser publications, it's all the same contrived slop created in advance to keep the lights on, and while I'm sure there are people who enjoy this kind of story, this isn't what "The Dangers in My Heart" started out as, and ran with for more than a hundred chapters.
What I think is that this manga semi-shifted genres for the sake of staying published, not in a major way, like for example Negima transforming into a battle shounen, but noticeably enough that the vibe feels off.
Like I said in a previous comment, I still enjoy this story and this stuff isn't a deal breaker for me yet, but it depends on what the author will do with it in the future.
