A Syloti Nagari font without the horaizontal line is needed.

[Sagir8453]

Defect Report

Syloti Nagari script is also written without the horizontal line.

Title

Should be brief but contain essential information.

Font

NotoSansSylotiNagari-Regular.ttf

Where the font came from, and when

For example:
Site: https://noto-website-2.storage.googleapis.com/pkgs/NotoSansArmenian-hinted.zip
Date: 2017-04-10 (preferred format)

Font Version

Current available on github, 4/12/2018

Screenshot

[simoncozens]

I agree with this. The Unicode proposal supporting material L2/388 also says:

The impression of words having a mātrā line is due to the medium, therefore, and not to the writing of the scribes themselves.... Syloti Nagri is closely related to Gujarati and Kaithi. Since these are not written with the mātrā line, it is not surprising that the same is true in Syloti Nagri manuscripts... Thus, we think the expectation that the mātrā line should be an integral component of modern Syloti Nagri type should be re-examined. The mātrā line is not a necessary element of Syloti Nagri type forms. It could be argued, in fact, that the mātrā line should be excluded from typefaces intended to closely match historic calligraphic traditions.

Noto's aim is to provide a "typeface for the nations" which covers all of the encoded Unicode codepoints. So the existing Syloti Nagari family is sufficient for this aim. But there are plans to produce "Noto Sans Hand", a more handwriting-focused font to be used for casual documents and handwriting primers.

My suggestion, then, is that Noto Sans Syloti Nagari maintains the headline, but when Noto Sans Hand Syloti Nagari is commissioned, this would not include a headline.