The benefit of Alire is that it gives you access to more than 280 Ada libraries
and tools. There is a growing community and adoption by some Ada developers.
(See https://ada-lang.io/ and https://gitter.im/ada-lang/Alire)
The alternative to Alire is to ask Ada developers to make and promote
their project as Debian package but I'm afraid this requires a lot of work.
Something that has been in the back of my mind also since the beginnings of the project is that I hope it should be relatively straightforward to generate Debian packages from Alire's metadata for someone familiar with Debian's Ada policy. If not, I would be interested in knowing about the obstacles. It would be great if Alire could give back to Debian, I have been a direct or indirect user since many years ago.
Álex.