Disagree, for people recently coming into the IT phase, it is important that you learn a diverse set of skills and the necessary pressure.
Yes, extremities can be avoided and in no way I am suggesting working daily 10-12 hr shifts.
However, if you are joining a small startup which is initially building a product, you should expect a fast paced work culture where you will have to put in long hours.
The good side of this is that you will be able to learn a lot quicker than others who are in MNCs where processes are generally bureaucratic and slow. This will eventually help you climb the ladder faster.
If you are someone who wants to reach the stage of an executive like a CTO, this is required. If you want to have a good paced comfortable life from the start, MNCs might be a better alternative.
I will probably suggest grinding for the initial 4-5 years and eventually moving on to MNCs for a better work life balance.