Well, I think that they're doing this for a couple'a reasons.
1. Hoarding of healing pots.
2. Hoarding of mats to make those pots, which previously became currency.
3. Rise of sword and board warriors.
The third is really the only thing that I think needs an explanation. If you think about it, there were only two sword and board warriors in the previous two games combined. Alistair & Aveline. ( I think I might have screwed their names up ) All the rest were two handed. Now, if you think about it... Who gets hit less often? A guy like Alistair or a guy like the Iron Bull? My money would be on a guy like Alistair every time. Because he's got a shield.
Myself, I've always sought out the sword and board warriors. Because I thought that they were better tanks. In the previous games however, that left me with very limited options.