Never said you did, I was just reporting my personal experience with a friend's phone
Unfortunately **** can happen, so it is best to always backup relevant data...
About the apps' installations/removals: you can have as many apps as you like, but on every OS (doesn't matter if on an embedded device or a PC) when you "change their status" (mostly when uninstalling) they leave small "traces", and sometimes these "traces" could cause major malfuncions