Why Verilog Is Not the End

Verilog is enough to design and simulate real RTL — you proved that across Course 1, from the first AND gate through the Tiny Calculator Engine capstone. What Verilog alone does not give you is a scalable way to check that design once it grows past a handful of signals.

That is the gap SystemVerilog fills. Three additions matter most for verification:

• Assertions state a rule once ("these two signals never go high on the same edge") and the simulator checks it automatically, every cycle, instead of you writing a directed test for every case you can think of.
• Reusable testbench classes let you write verification code once and reuse it across designs, instead of starting from a blank testbench file each time.
• Randomized stimulus generates input combinations a human tester would not think to write by hand, finding bugs that only show up in unusual combinations.

Course 1 taught you to build RTL and check it by hand. Course 2 (SystemVerilog Verification Essentials) teaches you to write the testbenches that do that checking at scale.