i always used apple app on my iphone, the thing was that i didn't know that electrum is still installed on my PC and linked to my wallet from the old times
That's not any better either.
Actually, sharing the same seed on two insecure environments will just double risk your funds....
Just buy a hardware wallet, or study good security practices like making an airgapped computer (there are also risks involved if you make a mistake or ignore some security recommendations).