I can see it from both sides, as I am both a tenant and a l/l. We rent out our UK home, whilst dh was first serving, then working abroad. We allow cats, neutral redecoration, and allow things to be hung on walls. The bathroom, having been newly done, was not allowed to be redecorated. We provide and pay for a gardener.
I've had three rental properties abroad. The first was a Married Quarter equivalent, where nothing could be changed, without one being charged for it, so you lived with it. We did put up shelves, and hang pictures, but that was about it.
The second was a private rental, which was someone's home, whilst they were working abroad. We could not redecorate anything, could not hang anything on the walls; had to keep to a strict schedule for the hedges being cut (and pay), and pay for boiler servicing, chimney sweeping, buildings insurance, water softener servicing, etc. Everything I pay for as a l/l in UK, I pay for as a tenant in Belgium. The leaving check out was brutal, under the rims of the toilets, the inside of the window frames etc - if a Belgian l/l can stick you for anything, they will.
The current house (and the last, as we are moving back to the UK, and my tenants have fortuitously given notice), is 245 years old, rented from a member of the local aristocracy, and is white throughout, bar one wall. He has been the best of the l/ls here, as he rents to maintain the house and have it lived in, not gouge a profit. He gets repairs done when needed, and hasn't bothered with the annual indexing increase with the rent.
Yes, one has on paper more security here, as the tenancies are longer, but you can still be given notice, as we were on house 2, as the owners needed to move back in. It is brutal when you leave as well, as there is no concept of wear and tear, so you are liable for any damage, however small.