Does DTS-HD and Dolby TrueHD covnerted to FLAC give the same soundtrack?

[N'Cha]

Hi

If I encode a bluray and convert the audio from DTS-HD MA or Dolby TrueHD 7.1 to FLAC for better compatibility with devices (for example my OELD TV and my monitor and an older tablet can't read the former formats when reading from a USB dongle, but can read properly FLAC and PCM whereas most modern receiver and soundbar can read DTS-HD and DolbyTruHD):

1. Will I give the same spatialisation/impact/effects ? Well, same results but just in FLAC format?
2. Can it output 5.1 and 7.1 ?
3. Can it "play" Atmos too?
4. If FLAC = roughly PCM or DTS-HD or Dolby TruHD in term of quality + compatible with way more devices, especially older ones, then why do Blu-ray don't use FLAC instead as its compression is better?
5. If I understand correctly, Dolby TruHD and DTS-HD have PCM at their core and they act more like containers right? and when decoded by receivers or soundbars, it actually reads PCM internally (something like that) right? Is it the same with FLAC? Like if I convert DTS-HD or DolbyTruHD to FLAC does it mean that PCM is also in the FLAC format? (like a container ?)

Thank you

[microchip8]

Both DTS-HD MA and TruHD are a form of lossless compression, same as FLAC is a form of lossess compression. For example, TruHD is Meridian Lossless Packing. A type of lossless compression.
FLAC does not support Objects like Atmos or DTS X.
PCM is not in FLAC/Atmos/DTS X. It's what you get when you DECOMPRESS it. PCM can be seen as "raw" audio, and FLAC as a (lossless) compression tool.