I say switch it up. Try 3 weeks of all compound first, then 3 weeks of alternating. Personally, I’m big on variety and keeping the body guessing, but I guess it depends on your own personal goals.
There’s many ways of adding variety and switching things up without fatiguing your muscles such that your compound lifts suffer.
Well in some cases it really works. If you have stubborn delts, then isolating the delts first, then hitting a compound lift like militaries can work. Pullovers or straight arm pulldowns before chins, leg curls before SL RDLs, tricep extensions followed by dips or close grip benches.
In this case, though, I wouldn’t do triceps first before regular bench presses.
Yes, I agree with you. In some cases, pre-exhaustion techniques and what you describe are appropriate. But I agree here that tricep isolation should come after compound work.