It depends on what type of multitasking we’re talking about. Editing a photo on Lightroom/Photoshop and editing video on FCP is not the same as browsing the web and editing documents on Word/Pages. Considering the OP uses a lot of tabs opened on Safari, Office apps, then 16GB is more than fine. But if you’re purchasing a product for 5-6 years of usage then you might want to bump up a spec just in case. The better argument to be establish here is that RAM management and other specs have gotten better throughout the years, even more so now with Apple with the SoC chips. To put it into perspective, as someone on YouTube said:16Gb will be fine for multitasking in 5-6 years. Heck, 8Gb will be fine for multitasking in 5-6 years.
We had these same comments in 2016.
16GB on M1 = 32GB on Intel