Ill put an inverse of the scenario.
1. Slower strategy, PLA takes 5000 dead but have an 70% chance of success
2. Aggressive strategy, PLA takes 25000 dead but have an 95% chance of success
In that scenario, I would still advocate for strategy 2. There has to be a focus on the objective: victory and reunification. Its better to suffer a bit more for a greater guarantee than to not suffer and fail, have this drag on for another 80 years.
I expect the same from PLA soldiers and Taiwan civilians. Soldiers would like to wait until enough DFs have saturated ROCA, but the chances of success is greater if the coup-de-main is pressed earlier and in greater strength, in spite of the casualties. Likewise, its probably better if civilians are not significantly harmed in the process, but the advantage of denying enemy roads by bombing bridges and crossings, destroying electrical power and transmission, destroying communications, and even hitting civilian farm sheds because they can be used to conceal heavy equipment cannot be denied.
You make choices based on the greater strategic situation, certain things have to be sacrificed. During operation Market Garden, they lost sight of the strategic objectives, certain airborne forces did not focus on bridges despite that being the entire point of the operation. The Air Force did not want to do a single drop and chose a landing zone too far away because they did not want to risk the pilots and planes, and was slow to offer air support for the same reason. In retrospect its better to have sacrificed 200-1000 airman for the 8000 paratroopers and ending the war months early, but they held back and lost focus.
This must not happen for reunification. No one want more PLA casualties and no one want dead civilians, but reunification must succeed.