If you use monitoring apps like iStat Menus you can clearly see your memory pressure and actual amount of free RAM unused to gauge the real demand of your workflow.
In my experience, on my 2017 iMac with 64GB RAM installed, normal idling would yield about "44GB Free", conversely this tells me any Mac with 20GB or less will just have macOS using all RAM for various purposes (namely for caching). Once I get to do even some work or just multi-tab browsing, the "Free" amount quickly drops.
With the speed of the internal SSD inside M1 Macs these days it is unlikely you will feel slow down even when RAM is absolutely used to the max, it only gets noticeable when you start using apps that seriously demand that much more memory envelop than a 16GB environment. If you are that sort of user then the M1 series of machines being clearly entry level products, are perhaps just not for you.