In the old days I was told being crazy that i stored the full year including century because it took over 2 bytes extra for all records. Lot of companies ran into problems when reaching the year 2000.
The size is totally irrelevant nowadays. Only problem is that it takes a while to get it uploaded. But you have to find out only once. After uploading your application you don’t have to upload the _libs again, just the changed applications. But the drawback is that you have to find out which libs are neaded and which not.
On the other hand, I would welcome a provision to set the needed libs or better, that SC will find out what parts is used and what not.