States can already turn off the switching by selecting permanent ST. This bill simply adds permanent DST as another option. It doesn't not force anyone into permanent DST.
It's actually the exact opposite. Permanent DST means that kids will be starting 1 hour earlier relative to sunrise, which is terrible for educational outcomes.
Daylight savings effectively shifts school 1 hour earlier relative to sunrise, which is the exact opposite of what is good for kids (who need more sleep than adults).
The reason that ST > DST is that bedtime is largely influenced by the sun, yet wake time is largely influenced by work / school. When sunset is pushed back an hour, people get less sleep, and for kids this is massively detrimental to their education. India is doing this experiment in real time because they only have one time zone. Kids in the western half, where the sun sets later, have much worse educational outcomes, and as you move east the education outcomes get better.
The sun sets about 2 hours later during the summer than the winter (depending on lattitude). DST adds an extra hour. In other words, 2/3rds of the "longer day" effect is from earth's tilt, and only 1/3rd is from DST. Seems like some people misunderstand this.
They mean 1 hour earlier relative to the sun cycle, and they are correct. Because the sun strongly influences our circadian rhythm, this is the correct frame of reference, from a health standpoint, not wall time.
If you get up at 8 every day, you're getting up ~2 hours after dawn (depending on date/location). When DST hits, 7 becomes 8, and you're getting up ~1 hour after dawn.
The problem with daylight savings is that people generally go to bed later, because the sun influences what time we feel tired. For adults with a flexible schedule this may be OK, but for children it is a disaster, as their school start time does not change.
India is basically doing this experiment in real time with their one-time zone policy. Children on the west do worse from an educational standpoint because the sun sets later, yet school starts at the same time.
This was widely covered in the news a few years back.