
I don't see the issue in the blend of action and romance genres. If done well they're pretty badass and heartwarming. If done bad... well, the fault isn't the genres' compatibility. Not even close. Σ(  ̄□ ̄||)
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About mental age... Have you ever read cultivation webtoons?, MC can be 1.000 years old, reincarnate into a kid and still fall in love with a partner. For one, it's fiction ffs, and for two, get out of their f*cking bed!! ( ̄∇ ̄")
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Characters need personal life to feel genuine, plus enriches the story, plus people enjoy it.
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I don't have anything against genre focused stories, like full action and the like and neither do I talk pest about genre blends. You know, I just let the authors do their thing. It's not like they produced it with my money for me to have any right to talk about do and don'ts about their work.
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I'm just saying we have to be thankful they work these stories for our entertaiment afterall. ╮( ̄▽ ̄)╭

I don't really read cultivation stories lmao... I am grateful they work hard to do all this. I was just stating an opinion so yeah. I'm glad you took the time to write down your own opinion tho ヾ(❀╹◡╹)ノ~ I can see where you're coming from. This particular story, I hope there is no romance but if there is, I would still give it a shot for the plot's sake.
I'm seriously hoping that there won't be any romance in this story. Crushes here and there are fine but I hope Art will reject them. Because one, it's a better story without a romance element and two, he's (literally) much older than probably even his parents (maybe by a little or more or less their age). I don't think it's appropriate to add romance into this story.