Hand holding 300 mm telephoto lens available?

Actual camera shake test putting 300mm telephoto lens on SONY α 9 proved almost perfect by comparing hand holding and tripod fixed condition, pixel peeping done on LCD was performed. Superb Linhof Tripod in MINT condition that probably costs over 50,000 yen is sold at 1,000 yen, how come? Experimental trial for camera shake done this morning solved this problem fairly. Though I imagined the priority that the mechanical stability by tripod must exceed any recent sophisticated inventions was betrayed at all. In addition, most of the adequate shooting places inhibit tripod use including monopod, even self shooting tiny holder for smart phone is not allowed, how come? Nara Park Kasuga-taisha Mannyo Botanical Garden that I visited the other day had the similar regulation as above. One of our photo group had his tripod stolen in the garden at that time, how come, it was just a show off or mischief?