As I told you, I understand your reasons very well. I'm absolutely conscious of the importance that Glamdring has in the lore, as the legendary blade of Turgon.
Only, consider the context in which we are: Gandalf is already a quite complete hero. We can't replace spellbook spells, we can't replace or change any of his iconic abilities and we must also consider his defined characterisation as a mass-slayer. If we are to conceive a proposal for Glamdring, we would probably be forced to change some of his abilities and, most importantly, to come up with an alternative for Arnor's Gandalf. So, leaving things unaltered prevents these additional (and not needed) issues from burdening us even more. Lightning Sword is nonetheless present and it will always be so. For the ones who know about Glamdring, that ability already represents the sword's might.
On the other hand, as Gandalf's mission started as soon as he set foot on Middle-earth, both Arnor's Gandalf and Gondor's one wield Narya (and even the Blue Mountains' Gandalf). We thus don't find any problem in adapting the proposal to the game, given also that it adds something more without altering the current design (in any way).
Blue, by opening this thread in the first place, it's you who have given the greatest input for this debate to develop, and I'm grateful to you for that. But the final solution had necessarily to be a compromise among our own divergent views and respectful of those famous boundaries. It may may lack something (Glamdring), but I think it's the only viable way to get things done (which is eventually the most important thing). I hope you'll understand. Just think about: not so much time ago, even hinting at possible changes or additions for Gandalf would have been quite impossible. I guess we have all done a marvellous work. The best we could have objectively done.