Maybe others like this pushy attitude but it wouldn't work in my company.
The EV of contacting people like this is high. You should do it.
On a related note, I've found that I get a lot of benefit just by calling and speaking to a real person. For instance, an airline representative once saved me nearly $800 on an offer that was not mentioned anywhere else
Please don't listen to this guy, it's very bad advice
You only skip the HR process if you have a pre-existing relationship with a decision-maker in the company. Cold-calling can work, but the most likely outcome is getting black-listed if they think you're one of the crazies.
If you really do want to go the cold-call method, use the cold-call to establish a relationship (i.e., ask for career advice, to talk about their technology stack, etc.) Once you have a real connection, then it may be appropriate to give them your resume.