Honestly, I am pretty surprised that Baikal requires that much :D It should literally take no more than 100 MB of memory and way less CPU, IMO - or did you mean the size of a VM?

In general, I agree with the sentiment - at the same time, I think the idea behind Nextcloud is to cover more use-cases at once and serve as some kind of a “extensible platform”… and honestly, it does that quite well

+1, Thunderbird’s Calendar is the best OSS calendar application out there.