Does the FAA construe FAR 91.225 as imposing a general prohibition on flight above 10,000' MSL (excluding airspace below 2500' AGL) in aircraft without ADS-B-out, even for aircraft without engine-driven electrical systems?
For example, does the FAA construe FAR 91.225 to prohibit a glider without ADS-B-out from exceeding 10,000' MSL, unless it is not above 2500' AGL?
If answering "yes", please provide specific examples.
For the purposes of this question, "aircraft without engine-driven electrical systems" means any aircraft that was not originally certificated with an engine-driven electrical system, that has not subsequently been certified with such a system installed, including balloons and gliders.
The motivation for this question is a conversation at a glider club where some pilots stated that their understanding was that gliders without ADS-B-out could not legally exceed 10,000' MSL, unless below 2500' AGL.
This related answer suggests that FAR 91.225(e)(2), which contains the prohibition on flight above 10,000' MSL for aircraft without engine-driven electrical systems, is best interpreted to only apply within the lateral boundaries of Class B or Class C airspace.
The current question is not about best interpretations of FARs, but rather about actual FAA practice.
Also, the current question is not about the significance of the phrase "without electrical systems" rather than "without engine-driven electrical systems" in FAR 91.225. This letter of interpretation from the FAA Office of the Chief Counsel clarifies that the references to aircraft "without electrical systems" in FAR 91.225 should be understood to instead read aircraft "without engine-driven electrical systems", and that the omission of the phrase "engine-driven" was in fact simply a mistake.