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On the Topic:
Currently RSAF is using Tornados , F-15's , Typhoons.
Now lets think that RSAF inducts Rafale too & yes it would create some technical issues in terms of repairs and maintenance but that can be dealt with asking France to Provide you a home Repairs and Maintenance facillity .
Typhoons , Hawk Trainer , Tornados are directly linked to BAE systems and as far as i am aware of the Typhoon program the Saudi Air force is eying a home assembly line for Typhoons which will come in handy.
RSAF already has a F-15 facility which will still do its work properly.
Rafale is the only platform you need to worry about and i think when you think about defense , you wont worry about spending some money on it.
RSAF has no issues with technical expertise as they can Employ Technical staff from Pakistan if needed.
Now the advantage of operating Multiple platforms will end up in great understanding of the technology trends and technical know how which will help you guys to build a stronger air force & it is good for Pakistan too
PAF at one time was operating:
F-16A/B
Mirage III/IV
F-6 Farmer
A-5 Fantan
F-7 Skybolt
6 Platforms at the same time from which two were twin Engine jets and they were from 3 different countries.
Operating Multi platforms as its own pros an cons but at the end of the day it improves your Reliability and Multirole capabilities.
Take care