There isn't much I could replace that with right now unless I opt for the 14 inch Philips CM8833 Mk 1, it has a nice tube but I prefer to use that for my Commodore 128D which has digital RGB for crisp 80 column text in addition to the analog video out.But the facts remain facts, regardless of the job difficulty. So in the event of a job where you have 400 capacitors, you would need to decide if its worth it. If it were me, I wouldn't recap it at all and probably even try to get rid of it. A partial recap wouldn't have much meaning, even if it did result in some seemingly good result.
But in my experience of recapping vintage Mac main units (never any monitors or anything with 400 capacitors), I have not been put in a position where I needed to make hard choices like that.
Again, no fluid-filled capacitor has eternal life. So we must use our own good judgement on how to deal with that unfortunate fact. This is not me chastising you or anyone else either. It's just reality we are all faced with, sadly.
I did look at alternatives such as using an LCD via the OSSC upscaler but couldn't tolerate the video synch delay I experienced especially in demos when it would switch the screen mode between different scenes, or to and from Workbench. These LCD displays have some latency too, so they don't handle the silky smooth scrolling very well that these machines are known for.