User Interface is a challenge on Sequoia as compared to El Capitan

I was going to suggest checking the various options in Accessibility, but as you say you have already done that, the only other thing I can suggest is to try Dark Mode. This has been around for a few years (though more recent than El Capitan), and is easier on the eyes and the text is more readable, IMO.

This is more in the way of feedback and that's best posted here:

Feedback - macOS - Apple

The more concrete examples you can give the more useful it will be.

deltoidsun wrote:

User Interface is a challenge on Sequoia as compared to El Capitan

People have the same complaints one macOS to the next macOS year to year— nothing new here.

You jump 10 years from a 2015 OS X El Capitan to a 2025 macOS Sequoia....

there will always be challenges. Full stop.

it never pays to get too far behind in the hardware or the software...

Change is the one thing you can count on.

Baby steps along the way is much easier to digest compared to a huge jump.

I say congratulations on your recent purchase and stepping into the future, I fully suspect you will adapt given some time.

You have 90-day complimentary Support (800) MY–APPLE (800–692–7753) on your new purchase. I would take advantage of that support if needed.

Apple does what Apple believes is right for Apple

They have worked this way for decades

I do not see this changing any time soon.

We may consider preparing for the Successor to Sequoia which is macOS 16 Tahoe with the “ A new design with Liquid Glass. Beautiful, delightful and instantly familiar. “ 

If you run old software then it is critical you stay on top of changes Apple makes every year so you know what to expect. IMHO iTunes/Music have been going downhill since iTunes 7. Eventually you are forced to transition and then comes the big shock. In particular Apple makes big transitions every few years. I kept iTunes 7 running on every OS up through High Sierra, but iTunes 7 is a 32 bit application and after Catalina you could no longer run 32 bit applications. I also found that Sequoia won't let you run iTunes at all, even 64 bit versions.

If you are still running El Capitan vintage applications now, remember that the next big transition comes in just over two years time when Apple releases its post-Tahoe macOS version. That won't let you run Intel version apps at all. So anticipate another software mass extinction then.

I agree, but it won’t change anything!

Self correction.

Should read Tahoe 26 as Apple has changed the numbering system for all versions of All Operating Systems

Re: “… it never pays to get too far behind in the hardware or the software … Baby steps … “

Well stated.

I’m unfortunately rapidly approaching (if not already beyond) that point now w/ Ventura.