I'm wondering if I need to go for the 16GB version, this is what my 8GB M1MBA looks like. A lot of swap. I see a lot of Safari web content (cached) processes.
There's nothing wrong with using swap as long as data isn't continually being swapped in and out. The "memory pressure" gauge is the one you need to look at. Swapping out memory used by inactive browser tabs or backgrounded apps that need a user interaction to re-start is the perfect use of swap.
More importantly, though:
if it ain't broke, don't fix it. If your machine is running smoothly doing what you need it to do then
you have enough RAM.
8GB should be good for general use, I'd go to 16GB if I were doing heavier "creative" or scientific work and only if I knew I needed to load gigabytes of data into RAM would I worry about having more than 16GB - in which case I would be waiting for the M2/M1X/whatever "pro" machines with better GPUs, more cores and more I/O bandwidth, anyway.
In a perfect world, Apple should have started the new Macs at 16GB, because RAM is so cheap in 2020 that putting less should hardly worth the extra logistics of juggling two different models. However, in a perfect world, Apple would be making wooden abacuses carved from sustainable fast-growing biomass and bartering them for organically grown walnuts. In the real world, Apple can trouser ~$150 of pure cash-y money by upselling customers to 16GB RAM because future proofing, while keeping the headline price under the magic $1000 - but, hey, the financial incentive to design your own CPUs doesn't grow on trees.
400 Chrome tabs seems to be pushing it though
Don't do that then.
Seriously - learn to use bookmarks. I can understand pro musicians who need a 100-piece orchestra permanently loaded into RAM. I can understand graphic artists who need scores of high-res layers in Photoshop. I can understand IT bods who need half-a-dozen VMs each with 4GB RAM allocated... but I've yet to see a justification for needing dozens of browser tags open (beyond the 30th Amendment of the US constitution: "If some is good, more shalt be better.")