My response to most negative reviews of Rent-a-Girlfriend after deep study.
Short answer: Hypocrisy. "It's only good when Friends, Big Bang Theory, The Office do it" mindset.
Real human growth is NOT linear. It is messy, full of setbacks, and people often revert to old habits more often than they don't.
The criticism (hate, actually) of Rent-a-Girlfriend is always a hallucination manifesting from a fundamental clash of expectations. A lot of viewers (their mother-tongue "coincidentally" the same!) wants to be fed a predictable story arc where a character goes from point A to point B and stays there. Japan doesn't do "asking out" casually. Watch some NBC medical drama, not anime, if your comfort zone is taking the top priority. Tension, drama, suspense don't have to play by the rules you've been conditioned to get accustomed to.
When Rent-a-Girlfriend mimics the slow, halting reality of unrequited or one-sided love, or complex feelings, especially within the cultural context of Asian dating norms (and it's really broad, not just Japan; try 75% of the population), it gets judged by formulas it isn't trying to follow; formulas even Hollywood shouldn't be following 60th year in a row.
The backlash against characters like Barney Stinson or Jaime Lannister is my go-to example of that Hollywood bias. Audiences, and your average holier-than-thou "critic" and "media literacy" folks got outraged so unreasonably because those characters didn't get a neat, permanent, one-directional, predictable, comfortable, sanitized, "redemption arc," even though real people around all of us, especially us, relapse into their worst traits all the time. "Kazuya bad, Ross Geller bad, Ted Mosby bad, somehow Rachel good, Carrie from Sex and the City also good" is the mindset that's "problematic" but some publication like "Anime Feminist" (lol) would never comprehend; their hubris wouldn't allow them to.
When looked at through that lens, the pacing isn't "stretching time for profit," to that extent as it is capturing how agonizingly slow and frustrating it actually is to navigate intense insecurity and unearned affection in real life.
"I'm determined now and will settle this once and for all" and "power of friendship" and "power of love" are speeches and not real-life boosters. The girl you now feel confident to confess might not show up for the next 3 months — that's the reality.