No, the weight of an LP has no bearing on the quality of the sound of the vinyl. A heavy record just seems nicer and makes you feel a little better about paying $25 - $40 dollars for a new copy of a record you paid $5 - $9 for 50 years ago. I haven't encountered any problems with the spindle holes on new pressings. And I haven't owned a turntable changer where you could stack records since I was 12 - it's totally manual TT's for me - and I wouldn't stack records if I could.
The 180 g record center holes do not fit on my Lenco L-78 manual turntable.
There is nothing wrong with stacking records if you keep them clean and have the right equipment. Most of the fear of stacking comes from two sources:
1. Many changers made before World War II did damage records. Some of them broke the substandard records made during World War II, But most of the changers made after World War II were gentle enough to not harm records. One reason was that the gentle devices were locked up in patent protection before the war. Many record collectors still remembered the old devices and were afraid of changers.
2. Snobbery from the elite who did not know the facts about stacking records: They were afraid that the grooves touching each other caused damage. But unless the records are badly warped, the grooves on modern microgroove records never touch each other. The labels and the rims of the records are thicker so the music grooves are separated.
I stack records with no fear of anything happening to them. I have an electronic air cleaner in the room to remove dust, and I clean the records before stacking them.
My favorite changer also has special features to take care of the records:
- The turntable stops turning during the change cycle so the record drops on a motionless turntable or record below. It is back up to speed when the arm sets down.
- The record drops flat so it is slowed by a cushion of air.
- The record dropping system does not use expanding grippers to hold up the next record. A record pusher pushes the bottom record to one side to drop it. And when the pusher retracts, it lowers the next record to the ledge instead of suddenly dropping it.
- The arm cannot automatically set the stylus on an empty turntable.
- It has a cue control to raise and lower the arm.
- The turntable is not used to drive the change cycle, so the cycle happens at the same speed no matter what record speed is selected.
- The Shure magnetic cartridge is designed to be very gentle on records. And antiskate is used to balance the stylus force against both groove walls.
- The overarm is not used to detect an empty stack, so it does not push the last record down with more force.