OK, I'll bite - why do lap bars ruin it for you? What's the problem?
The ride was not designed for lap bars.
The ride ran for decades without lap bars.
Lap bars are an "add-on" which will be a compromise, at best.
The load/unload-time will be slowed, so the lines will be longer, and the FP's can run out sooner.
And, has been discussed in other threads, it is likely that larger/taller guests may not fit as well or as comfortably (or at all) with the added-on bars and mechanisms.
Also, if the ride does E-Stop (emergency stop,) will some guests be able to open the bars and make an emergency exit without a CM to assist.
I don't like the idea of being "locked into" a water ride.
Also, with the many guests who want to ride with their smaller kids (tall enough to ride, but still young) in the same seat, the car capacity will likely be more limited than before.
With any kind of change, "unintended consequences" can pop up.