There was no fun play for bonuses. Not much incentive to reel attackers in.
...yet only 2 of the 5 main mountain days went to the early break in 2014, 2 out of 5 in 2013, 2 of 4 in 2012, 0 out of 4 in 2011, 3 out of 5 in 2010, 2 out of 4 in 2009 and 2 out of 4 in 2008. That comes to 13 out of 31 stages, or 41.9%.
The years since then: 2 out of 5 in 2015 (and of the other 3, Nibali and Pinot went early without drawing a reaction from the main GC contenders which I haven't counted for the break), 4 out of 6 in 2016, 2 out of 6 in 2017 (I've counted Barguil's first stage win here), 1 out of 5 in 2018, 4 out of 6 in 2019 (counting the Tignes stage as a win for the GC group because it would certainly have been one had the stage finished), 3 out of 6 in 2020, 3 out of 5 in 2021, 2 out of 6 in 2022 and so far 3 out of 5 this year (counting Hindley for the breakaway because that's where he won from). That comes to 24 out of 50, or 48% - more than in the 2008-14 period. You could argue that the increase in the number of legitimate mountain days (and the decrease in their difficulty) plays a role here, but in any case there is no evidence addition of bonus seconds incentivizes GC riders to go for stages - if anything, to the contrary.