Smaller dimension of compressor doesn't make it weaker, or prompt for more failure. Unrelated.
Compressor is about how motor compress the gas, and heat dissipating.
How well the motor compress, depended on the motor capability.
How well the heat dissipated depends on cooling coil surface area and air-flow (fan blowing the hot air out).
It is not like the compressor bigger in size (outer dimension), then it is must be more powerful than a smaller one.
It depended how inside is built.
Many 1.0HP and 1.5HP has the same size of blower, but their BTU is different.
We can't say hey, 1.5HP using same size with 1.0HP, so the 1.5HP is inferior, manufacturer should give me a bigger one for 1.5HP.
Ah, what every and how is writen, he will just say "You statement in paper like". Ignorance is a bliss
Just pity the other who take his work and statement. Who know, maybe the entire Malaysia Panasonic and non-intverter sales will be affected and soon the A/C department will be closed.