The 16GB RAM limit is unfortunate. Five years later and I still can't buy a new 13" laptop from Apple with more RAM than my 2015 MBP. Edit: Apparently you can configure a (Early 2020) Intel-based 13" MBP with 32GB of RAM - I was not aware of that. Hope they bring that option to the ARM versions ASAP, especially if the performance gains are as good as Apple claims.
Not all RAM is created equally. Better memory management means less RAM can be better than more RAM. Pair that with superfast flash storage for SWAP and you might not even be able to tell the difference between 16 and 32. Besides, this release cycle is 100% optimized for an impressive speed boost, tempered by a need for a more impressive battery life. The proof will be in the pudding.Time will tell.
No, it can't. If more RAM means it's slower RAM then maybe it can be better to have less of it in some workloads. But otherwise it's never better to have less RAM than more RAM. Better memory management can make the impact of less RAM be less severe, but it's still unambiguously worse.
Especially if you have workloads that actually need the RAM like large ML models or editing 8K videos.