The answer to your question seems straight-forward: they still do.

1. Companies have tuition reimbursement for general employees, but it's usually nominal at $5k/year and part-time education is implied.

2. Executive MBAs and more selective executive seminars are covered by companies so the focus will be better. These aren't cheap (easily $125k/year) and might come with early exit penalties. I'd be surprised if the Bells lab offer didn't have similar clawbacks.

3. Tuition in 1970 isn't what it is now! Wayyyy cheaper!