I don't know about 'good' or 'bad' ..
all i know is b4 this upgrade restriction thing came we had lots of fun...a lot of MP4/3 payers joining groups, training ,fighting and such....and yeah with that abuse too hehe ...but atleast MD was alive.
Some MP5 vets players used these so called 'Abuse' so stir things up and used this to their advantage (as always) to find more targets to increase their stats and train their creatures. Thats how this rule came into exist.
Now i c many noobs advance to c their creatures in upgraded lvl only to realize their mistakes.
I m