From what my Epson guru tells me the newer heads on the 7xxx/9xxx series are an improvement, less likely to clog or suffer other issues.
He told me that it is generally not a nozzle clog but debris on the head. He uses Windex which has a little ammonia in the mix and good-quality paper towels to clean the build-up.
I've replaced the head wiper, an easy fix, before I had him replace my head. My 9900 is 12 years old and I've had it 10 and figured I got my money's worth from it.
Since I was about to print canvas today, I ran a test and a cleaning cycle. The test showed 3-4 channels with 1-2 small gaps in each and looking at prints down just before, I could not see any problems.
For years I had one channel with 1-2 nozzles that didn't print and the prints did not show any problems. After a professional cleaning and other minor replacement parts were installed, the clogs went away but overall with all the canvas I was still running, there were still some cleaning issues.
With the new head, which is the new and improved version, there seems to be fewer cleaning issues now, but that could also be on account of doing less printing for much of the year due to the shut down. One or two clogs isn't a problem you can easily see on a print. However, it could indicate a good and careful cleaning of the head and the capping station is in order since the inks combined with paper and canvas link likes to gum things out and though it is a messy job to clean, it's fairly easy to do.
As always, YRMV and you are on your own if you do your own cleaning and/or repairs!