Convert only if working with very old software that can't handle modern formats or specific professional workflows requiring BMP. For most users, converting GIF to PNG is much better - PNG is lossless like BMP but vastly smaller with universal support.
No. GIF is limited to 256 colors. Converting to BMP won't add colors back or improve quality - it just stores the 256-color image in an uncompressed format. To improve a low-quality GIF, you'd need the original higher-quality source file.
BMP files are typically 3-10 times larger than GIF because BMP stores all pixel data uncompressed. A 500KB GIF might become a 3-5MB BMP. You're trading massive file size for no quality improvement.
No need in modern workflows. PNG is lossless like BMP but much smaller. All modern image editors work excellently with PNG. Use PNG instead of BMP for editing - you'll save tons of disk space with identical quality.
No. Converting GIF to BMP only saves the first frame as a static image. If you need to extract all frames from an animated GIF, use specialized GIF extraction tools that can save each frame separately.