This whole MBT debate extends to other services as well. Due to limitations of personnel, resources, and political will and direction, the CF is constantly choosing one or another capability and getting rid of another.
At some point, it was decided to cut our in-air refueling capability. Something we need, but just couldn‘t have.
Someone has decided that Canada can have submarines, but not aircraft carriers or decent naval choppers - but having both would be nice.
In the 1990‘s, for a variety of reasons it was decided that the CAR capability as not needed, but that a JTF2 capability was.
A military with subs, carriers, transport ships, C-17‘s, MBT‘s, Airborne, CF-18‘s, guided missile cruisers, etc. would be nice and arguably all necessary. But there has to be picking and choosing. It‘s a zero-sum gain - we lose one thing, but can gain or increase another. What is the oppurtunity cost of having MBT‘s?
If DND has $500 million to spend, is it better to have: (I‘m making these numbers up)
100 MBT‘s, or 150 LAV3‘s? or 2 C-17‘s? or 10 new CF-18? new coaches for NDHQ? or 6 years of good training for the infantry?
Once acapbility is decided upon, how do you meet it? Is it better to have 100 old Leo‘s, or 50 brand-new Challanger 2‘s? or 50 Challanger‘s or 25 Apaches? 100 leo‘s or 100 Chinooks? 72 Generals and Admirals or 72 tanks?