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I intentionally use spinning hard drive on any data that are transient or have heavy write operations: swap, logs (ie /var/log/), etc. The spinning hard drive should last a long time and they are fairly cheap, while the performant and main data stays on NVMe or SSD.

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If you use the - option in syslogd configuration for non-synchronous writes then /var/log will be only a tiny portion of writes. If you have a mail server then the many log messages about a message delivery will have hardly any write load compared to all the synchronous writes to the mail queue and mail store.

The only time I've seen a significant part of write load coming from /var/log is when the systemd-journald log database or a database server replication log or rollback log is there.

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