Oh I'm not trying to convince you of anything. I'm just expressing why I disagree with that assertion because....well frankly I find it odd.
At the end of the day, Damian changing his costume and code name now wouldn't make anything terribly different for him. He's already as far removed from Batman as any acting Robin has ever been since, maybe, the end of Dick's tenure. Might as well finalize it at this point since it doesn't look like his relationship with Bruce will be getting better anytime soon. What would change for him if he stopped being Robin, aside from his name? 13 may be too young for a normal child to be on their own. In almost every other case I would agree with that. But...Damian's not a normal child. I enjoy his moments where he gets to be one but, unfortunately, that's just not what he is. He's been taking care of himself since Rebirth started. Maybe even a little before that.
There's no need to do something as extreme as killing him off just because his time as Robin is up. That'd be such a lazy solution and a waste of what could be a solid character arc and new status quo for him. He should not be so tied to the Robin identity that his only option is to die when he loses it.
Then give him something to do. He's far past the point where not being Robin anymore means his only other option is go back to his mother's way of life. That just makes it seem like he has no agency of his own. Like he's completely incapable of being a hero without the Robin title. Or that his only option is to bounce back and forth between two neglectful and/or abusive parents. He doesn't need either of them right now and I sincerely hope whoever's writing him going forward has enough of a creative bone in their body to know what they wanna do with him. Because there are a couple of things they could do before going "Whelp, he's not Robin anymore. Guess he should just DIE!"Damian has died twice if her can't be Robin then there is no place for him. They can ship him back to his mum I guess but there is no Room for a character who isn't doing something
But Dick and Tim both continued being Titans even after they stopped being Robin (hell Dick made his first debut as Nightwing in a Titans book). Why should Damian be any different? I may not really care for his Titans but not being Robin anymore shouldn't have anything to do with him not being with them. Like...that's just straight up incorrect.He can't do his own thing and no being in TT isn't doing his own thing. That is doing the Robin thing. Without Robin he has no business in the TT.
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Bear in mind, I don't want Damian to lose Robin yet. I want him and Bruce to be able to work this out so they can go back to being father and son. I want Bruce to stop ignoring his family for a woman who's practically turned stringing him along into an occupation.
But if this is the end for that...so be it. He had a good 14 year run (or 4 years, in universe. Like I said before, he might not even still be 13 right now). But it doesn't have to be the end for Damian as a character. That's just a waste. He doesn't have to be chained to an identity that was meant for Batman's partners, when he hasn't really been Batman's partner for a few years now.