Can't say I used mine outside in sunlight more than twice, but it did work fine, brightness maxed out, can't say reflections where an issue, if anything the device became really hot.
This was with no screen protector.
Regards Obsydian - (Car & Tech Evangelist)
MY DEVICES: ZFold4, Watch6 Classic, Book2 Pro i5 5G [Laptop], Buds Pro2, M70A 32 & 43”; [Monitor], Smart Tags, Dell Inspiron G5 [Laptop] / FAMILY DEVICES: ZFlip3, ZFlip4, ZFlip5, Watch6 Classic, S8 Ultra; S7+ [Tablet], Buds Pro, iPhone 12, iPad Air 2, Air tags, iPad Mini 5, iPad Pro 12.9 GEN2 [Tablets] / HOME DEVICES: QN95A [TV], Q900A / SWA900S [Soundbar, Rears], MC28M6075 and MC32K7055 [Microwave], Jet 75 Complete (Vacuum), Samsung Level [Speaker]