That's the painful point. I wouldn't bring myself to truly love someone if I would know that it won't be more than a fleeting thing. Love requires commitment. Why care so much if the guy is going to die in a few decades?
Also, I call bullshit on the whole biolock thing. Were I on Rael position, and given the overall advancement of technology that the VN seems to have, I'd do anything to keep myself alive. BY ANY MEANS necesary. Making a clone and transfering the mind. Making a bio-synthetic body and doing a similar process, copying the memories into a synthetic brain and putting said brain into a synthetic body lookalike of myself. ANYTHING.
That said, I've been seeing a pattern in a lot of VN, and the biolock thing seems to follow a...unfortunate trend. The idea of taking away the player's/MC agency to put the MC an echelon down than the rest of characters, who are not subject to the same disadvantages. I see this as a bit of a shared knee-jerk reaction to the "power fantasy" trope seeing on other VN, but overall, at this point, taking agency away in places where isn't very impactful, seems irrelevant, and just makes the reader feel worse.