Earlier quoted context omitted.
What disgusting arrogance. There is no objective standard of "applicability" of any particular license to any particular piece of software. The LGPL is not "built explicitly for this purpose". The LGPL is a compromise license that exists for strategic reasons. There is no clear reason it should be applied here. That some people may not want or be able to use this library because of its license choice may matter to yo…
He's just letting the author know that the library is unusable with this license. So either people won't use it, or they will use it and violate the license. Would you seriously consider using (or even trying) a new library that has not even proved to be better than others yet, if you had to comply with GPLv3? I wouldn't.
Anyone writing GPLv3 software to begin with would be just fine with using this license.
The question you have to ask yourself is: am I OK with releasing my software under the GPLv3, or am I OK with rewriting this library if I decide to relicense my software under some other license. If you're OK with that, then you can use this library.