Now I haven't played RE3 since early PS2 days, and only played it for one day where I finished the game in one power sitting, so my memory of the game isn't exactly solid, but.. From what little I remember, Nemesis encounters were scripted repeated boss encounters, he wasn't a stalker enemy. Each encounter was set as a boss/chase sequence, he doesn't randomly disrupt regular gameplay beats like enemies in Clock Tower 3, Haunting Ground, Alien Isolation and now RE7. You really can't compare Nemesis to this.
You have a point, but people seem to think enemies are relentless in Resi7. They aren't. It is randomized so at times you have long stretches of rest. I found you could reset it too when entering a safe room, so if one is hindering you from solving a puzzle, you can track back a little and make him go away.
But they hardly do hinder you. The fact they can pop up any time makes the game very tense, but the chases themselves are rather short if you handle it right. It never annoyed me like the alien did in Isolation for instance.
Also, what I played felt so much like a classic RE I think fans will absolutely love it all...