Blast procs are an interesting and very well implemented take of DoTs. However, unlike other DoTs that can be put on mostly every weapon archetype, blast requires one of 2 things to be made good:
1. A weapon with high status procs per second to reach the 10 blast cap to cause continual 5m aoe explosions. Or;
2. A weapon that can reliably proc a single blast proc, and is able to kill enemies within 1.5s of the enemy recieving said blast proc.
Unlike other DoTs, this is a good example of making a mechanic to match the pace of the current state of the game. DE acknowledge that in the current state of the game, DoTs are just too slow to feel rewarding and natural. This balance of upfront damage combined with a status effect is quite unique, and I believe that other DoTs should exhibit a similar, but not identical, behaviour - perhaps gas to make it less gameplay degenerate.
There are a lot of weapons that can fill these conditions, but not every weapon - which I think is a good and healthy mechanic for the game. There's a reason why everyone sighs at viral/slash, it is too prevent and just works on everything for little thought/investment.
Overall, blast is very competitive on the correct weapons, and is probably my favourite status effect, followed by cold spam from companies.