I have up to 40 tabs open with 2-3 pdf, 1-2 Word, 1-2 Excel docs and it isn't stressing RAM at all. It just compresses unused tabs (makes sense, you can't view at once 40 tabs, but they still remain open just to check back later), so that memory is always ready to use.multitasking usage (lots of browser tabs open while working on a word-processing document, for example) will tend to put more stress on RAM
Some moves of Ram management in mac os:
1) Store in App memory part of RAM if in use.
2) Compress it - use less space but still reachable to use again.
3) Cached files - compressed stuff from step 2 is packed in the drawer for future use (39 out of 40 tabs)
4) Swap on SSD - cached files go to swap, if ever you need it.
I also tried to get a lot further, had 20 tabs with one youtube video playing, itunes music playing, running Zoom conference, running Davinci and editing video, 2 pdf files, 2 docs, 1 presentation, Team viewer remote control of win laptop - my ram at most got to 7gb of use. Pressure was green.
The only thing which almost killed 8 gb was a Lightroom, loaded with 100 of RAW photos from 24MP camera, and that thing alone ate almost 4.5-5gb of ram + 2gb Mac os functions = 7-7.5 gb of RAM was used and pressure was yellow.
So if i tried to do anything else, that would be a problem with 8gb.