World wars (wars generally) are kind of a mixed bag... They tend to emphasize what works, not what's new--but do allow introducing new in conditions no civilian would tolerate: so, surgical advances (frex) may happen.
As for electronics, how about this: Britain sees WW1 Zeps as a serious potential threat, & applies radio search (crude radar) to locating them, which means need for CRTs (& better vacuum tubes, & klystrons, & ultimately magnetrons), & better fighters to intercept & destroy them (so
monoplane fighters (shameless plug
), like the
Bristol M1 (to pick just one), which helps drive better materials tech.
The threat from U-boats could also help drive electronics developments: sonar & dipping sonar, & homing torpedoes.