Keeping NetBSD disklabel up to date

[beaker%sdf.org@localhost (beaker)]

Is it safe and sufficient to run 'mbrlabel -fw <device>' on NetBSD
whenever there has been partition resizing (usually via Gpartd)
such that the disklabel no longer reflects the current partitioning
state?

System in question is an old 32bit i386 with an MBR partition scheme
on a SATA disc hosting several Linux partitions and one NetBSD FFS2
partition.  Bootloader is GAG, not GRUB nor native NetBSD bootloader.

If I wipe the disc to recreate a multi-boot setup is there a better
partitioning scheme I could use for such an old system?  I don't
believe GPT is supported on the system in question.