Few points.I think the Canadian surface combatant should be equipped with either AN/SPY-1 or AN/SPY-6 Radar because with newly developing threats from nations like North Korea, Canada may have to deal with incoming ballistic missiles. Also, they should be equipped with extensive ASW hardware as these ships could be operating in an environment like the Sea of Japan or the S. China, even the Atlantic where there will always be potentially hostile submarines patrolling, whether they be from Russia, China, or North Korea. And as usual, they need surface warfare and air warfare capabilities to handle enemy bombers and surface vessels. Finally, I believe Canada may need more than 15 or 16 of these ships due to the fact that their potential rivals continue to expand their navies, which will continue to strain the United States as we try to keep pace with our adversaries(without a budget, lol). It will be necessary for our allies to bolster their naval assets so that we keep the edge over our enemies.
What you want the ship to do requires a vastly larger ship then what is being offered, with how delayed everything is and with Canadian politics it would be extremely risky and costly to restart the program as that is what would be required.
You can either doing something really well and be ok at the other (ie: The Hobarts are great for the AA role but can still hold there own in ASW), or you go big able to do everything really well but end up with a ship with a size and crew number comparable to a cruiser rather then a frigate or destroyer.
Why do they need more then 15 or 16? Yes other nations are building up there numbers but you need to look at it on the broader context. Canada only has so many dollars (Bugger all really) so any extra ships to add what would be a marginal increase in operational tempo would come at the direct reduction or cancellation in another asset be it from the navy, air force or army or a mix of all. Potentiual enemies are expanding their fleets but few are able to reach Canada and all of them have to go past or through nations that are either allied, friendly or share values with. Between South Korea, Japan, the US and Europe Canada is well surrounded with friendly nations whose combined might are more then able to check any potentual adversary, A few more ships at the expense of the broader Canadian forces preventing them from having a renewed submarine service or a properly outfitted expeditionary force or less aircraft is not a good investment.
What they need is a minimum target based on operational requirements and long term production so that they allow them selves to meet the minimum demand while having enough ships that they can sustain there supply line and fingers crossed have there local industry become more efficient (ie: Cheaper and better quality).