You can think of a cyno as a smoke signal:
A very bright smoke signal. So bright that a capital ship can see it from several systems away. This smoke signal lets it use its jump drive to jump directly to the marked location (or to create a portal for other ships to that location, as Titans and Black Ops can do). It is so bright that it requires a dedicated ship and a bunch of fuel to light, and it makes that ship stuck in place for a while as it blazes.
This signal is not allowed to be used in hisec. Why? Who knows? Maybe it bothers CONCORD, or maybe CCP want to force using a jump drive to skip over multiple systems involve risk. Probably that last one.
to make Black Ops ships more appealing in PvE content
That is not going to happen. A jump drive is handy, but it requires fuel, and it causes a cooldown (jump fatigue) so you can’t do it very often. Both of these prevent it from being used as a common travel tool, PvE or PvP. For good reason, too: years ago, alliances with enough capital ships were able to move their fleets to anywhere within Eve in less than an hour. It ruined the “vast” feeling of Eve, so the changes were put in place.
Lastly, Black Ops are simply not good PvE ships. Can they do PvE? Probably. However, if you are looking at spending over 1 billion ISK on a PvE ship, Black Ops are far outperformed by their competitors: Marauders and faction battleships. For example, the Widow you have is far outperformed by a Scorpion Navy Issue, which not only costs half as much, but has: 20% more damage (due to 1 more launcher), 4% per level (up to 20%) better tank, more CPU, more power grid, and more cargo. Also, if you are spending 500 mil ISK less on the hull itself, that is 500 mil more you can spend on fancier fittings for it, that even further increase the better performance.
Of course, you’re free to fly whatever ships you will, but there are some harsh realities of what is effective, what is not, and what the intended use of certain ships and items is.
That’s really all I have left to say on the matter. Have fun!