Probably more top 30 level opponents this year.
Also the perception is that the Big Ten West is more "on the rise" than in 2016. (Provided you believe WI and Iowa are constants).
Nebraska and Purdue are both arguably on the "upswing" vs being the last season before their coach gets fired. And Northwestern will probably be better than a 0.500 team coming off a Big Ten West title.
WI, IA, NW, PUR, NEB - That's 5 tough games.
In 2016, 3 of those were considered tough and 2 not as tough.
Also, PSU was reeling going into 2016 and thus we were favored I believe when we played them. In reality though, the 2016 and 2019 PSU teams might be very similar.
You really think so? Let's look at the results...
In the 2016 Big Ten West, final standings, compared to final 2018:
2016 Wisconsin: 11-3.......... 2018 Wisconsin: 8-5 (2 games worse in 2018)
2016 Iowa: 8-5................... 2018 Iowa: 8-5 (no change)
2016 Nebraska: 9-4............. 2018 Nebraska: 4-8 (Much worse in 2018)
2016 Northwestern: 7-6....... 2018 Northwestern: 9-5 (Slightly better in 2018)
2016 Illinois: 3-9................. 2018 Illinois: 4-8 (1 game better in 2018)
2016 Purdue: 3-9................ 2018 Purdue, 6-7 (1 1/2 games better in 2018)
Not seeing much difference in Iowa and Illinois; they seem more or less the same as in 2016, quality-wise. Wisconsin and Nebraska were clearly better in 2016 than in 2018. Northwestern and Purdue seemed better in 2018.
And as far as Penn State in concerned, well... I'm comfortable saying that the 2016 PSU team was a pretty solid squad. Big Ten Champs.
So, we'll have to agree to disagree, because I'm just not seeing any objective way to make the 2019 schedule look harder than the 2016 schedule.