Your "exact version number dependencies" have other dependencies which most likely are not "exact version number dependencies", so case described by @stereobooster still applies. You will most likely get different packages in time when you use npm install on your project without package-lock file, and your project may break because of that. I agree it's a pain to maintain it but sometimes there is no other way.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
You can always use exact version number dependencies in package.json. Package-lock.json is unnecessary.
Your "exact version number dependencies" have other dependencies which most likely are not "exact version number dependencies", so case described by @stereobooster still applies. You will most likely get different packages in time when you use npm install on your project without package-lock file, and your project may break because of that. I agree it's a pain to maintain it but sometimes there is no other way.